Release 4 5 Preview #2
This page is part of the FHIR Specification (v4.0.1: R4 - Mixed Normative and STU ). This is the current published version in it's permanent home (it will always be available at this URL). For a full list of available versions, see the Directory of published versions

Substancepolymer.profile.json

Biomedical Research and Regulation Work Group Maturity Level : N/A Standards Status : Informative Compartments : Not linked to any defined compartments

Raw JSON ( canonical form + also see JSON Format Specification )

StructureDefinition for substancepolymer

{
  "resourceType" : "StructureDefinition",
  "id" : "SubstancePolymer",
  "meta" : {
    "lastUpdated" : "2019-11-01T09:29:23.356+11:00"

    "lastUpdated" : "2020-07-10T13:39:04.142+00:00"

  },
  "text" : {
    "status" : "generated",
    "div" : "<div>!-- Snipped for Brevity --></div>"
  },
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-category",
    "valueString" : "Specialized.Medication Definition"
  },
  {

    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode" : "trial-use"
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 0
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-security-category",
    "valueCode" : "anonymous"
  },
  {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "brr"
  }],
  "url" : "http://hl7.org/fhir/StructureDefinition/SubstancePolymer",
  "version" : "4.0.1",

  "version" : "4.4.0",

  "name" : "SubstancePolymer",
  "status" : "draft",
  "date" : "2019-11-01T09:29:23+11:00",

  "date" : "2020-07-10T13:39:04+00:00",

  "publisher" : "Health Level Seven International (Biomedical Research and Regulation)",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://hl7.org/fhir"
    }]
  },
  {
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/rcrim/index.cfm"
    }]
  }],
  "description" : "Todo.",
  "fhirVersion" : "4.0.1",

  "description" : "Properties of a substance specific to it being a polymer.",
  "fhirVersion" : "4.4.0",

  "mapping" : [{
    "identity" : "rim",
    "uri" : "http://hl7.org/v3",
    "name" : "RIM Mapping"
  }],
  "kind" : "resource",
  "abstract" : false,
  "type" : "SubstancePolymer",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/DomainResource",
  "derivation" : "specialization",
  "snapshot" : {
    "element" : [{
      "id" : "SubstancePolymer",
      "path" : "SubstancePolymer",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Properties of a substance specific to it being a polymer",
      "definition" : "Properties of a substance specific to it being a polymer.",

      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "SubstancePolymer",
        "min" : 0,
        "max" : "*"
      },
      "constraint" : [{
        "key" : "dom-2",
        "severity" : "error",
        "human" : "If the resource is contained in another resource, it SHALL NOT contain nested Resources",
        "expression" : "contained.contained.empty()",
        "xpath" : "not(parent::f:contained and f:contained)",
        "source" : "http://hl7.org/fhir/StructureDefinition/DomainResource"
      },
      {
        "key" : "dom-3",
        "severity" : "error",
        "human" : "If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource or SHALL refer to the containing resource",
        "expression" : "contained.where((('#'+id in (%resource.descendants().reference | %resource.descendants().as(canonical) | %resource.descendants().as(uri) | %resource.descendants().as(url))) or descendants().where(reference = '#').exists() or descendants().where(as(canonical) = '#').exists() or descendants().where(as(canonical) = '#').exists()).not()).trace('unmatched', id).empty()",
        "xpath" : "not(exists(for $id in f:contained/*/f:id/@value return $contained[not(parent::*/descendant::f:reference/@value=concat('#', $contained/*/id/@value) or descendant::f:reference[@value='#'])]))",
        "source" : "http://hl7.org/fhir/StructureDefinition/DomainResource"
      },
      {
        "key" : "dom-4",
        "severity" : "error",
        "human" : "If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated",
        "expression" : "contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()",
        "xpath" : "not(exists(f:contained/*/f:meta/f:versionId)) and not(exists(f:contained/*/f:meta/f:lastUpdated))",
        "source" : "http://hl7.org/fhir/StructureDefinition/DomainResource"
      },
      {
        "key" : "dom-5",
        "severity" : "error",
        "human" : "If a resource is contained in another resource, it SHALL NOT have a security label",
        "expression" : "contained.meta.security.empty()",
        "xpath" : "not(exists(f:contained/*/f:meta/f:security))",
        "source" : "http://hl7.org/fhir/StructureDefinition/DomainResource"
      },
      {
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice",
          "valueBoolean" : true
        },
        {
          "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-bestpractice-explanation",
          "valueMarkdown" : "When a resource has no narrative, only systems that fully understand the data can display the resource to a human safely. Including a human readable representation in the resource makes for a much more robust eco-system and cheaper handling of resources by intermediary systems. Some ecosystems restrict distribution of resources to only those systems that do fully understand the resources, and as a consequence implementers may believe that the narrative is superfluous. However experience shows that such eco-systems often open up to new participants over time."
        }],
        "key" : "dom-6",
        "severity" : "warning",
        "human" : "A resource should have narrative for robust management",
        "expression" : "text.`div`.exists()",
        "xpath" : "exists(f:text/h:div)",
        "source" : "http://hl7.org/fhir/StructureDefinition/DomainResource"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "Entity. Role, or Act"
      }]
    },
    {
      "id" : "SubstancePolymer.id",
      "path" : "SubstancePolymer.id",
      "short" : "Logical id of this artifact",
      "definition" : "The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes.",
      "comment" : "The only time that a resource does not have an id is when it is being submitted to the server using a create operation.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Resource.id",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl" : "string"

          "valueUri" : "id"

        }],
        "code" : "http://hl7.org/fhirpath/System.String"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.meta",
      "path" : "SubstancePolymer.meta",
      "short" : "Metadata about the resource",
      "definition" : "The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content might not always be associated with version changes to the resource.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Resource.meta",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "Meta"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.implicitRules",
      "path" : "SubstancePolymer.implicitRules",
      "short" : "A set of rules under which this content was created",
      "definition" : "A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content. Often, this is a reference to an implementation guide that defines the special rules along with other profiles etc.",
      "comment" : "Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element. Often, when used, the URL is a reference to an implementation guide that defines these special rules as part of it's narrative along with other profiles, value sets, etc.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Resource.implicitRules",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "uri"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : true,
      "isModifierReason" : "This element is labeled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation",
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.language",
      "path" : "SubstancePolymer.language",
      "short" : "Language of the resource content",
      "definition" : "The base language in which the resource is written.",
      "comment" : "Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies  to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource. Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute).",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Resource.language",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "code"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "binding" : {
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet",
          "valueCanonical" : "http://hl7.org/fhir/ValueSet/all-languages"
        },
        {
          "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName",
          "valueString" : "Language"
        },
        {
          "url" : "http://hl7.org/fhir/StructureDefinition/elementdefinition-isCommonBinding",
          "valueBoolean" : true
        }],
        "strength" : "preferred",
        "description" : "A human language.",
        "valueSet" : "http://hl7.org/fhir/ValueSet/languages"
      }
    },
    {
      "id" : "SubstancePolymer.text",
      "path" : "SubstancePolymer.text",
      "short" : "Text summary of the resource, for human interpretation",
      "definition" : "A human-readable narrative that contains a summary of the resource and can be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it \"clinically safe\" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety.",
      "comment" : "Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied).  This may be necessary for data from legacy systems where information is captured as a \"text blob\" or where text is additionally entered raw or narrated and encoded information is added later.",
      "alias" : ["narrative",
      "html",
      "xhtml",
      "display"],
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "DomainResource.text",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "Narrative"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "Act.text?"
      }]
    },
    {
      "id" : "SubstancePolymer.contained",
      "path" : "SubstancePolymer.contained",
      "short" : "Contained, inline Resources",
      "definition" : "These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope.",
      "comment" : "This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again. Contained resources may have profiles and tags In their meta elements, but SHALL NOT have security labels.",
      "alias" : ["inline resources",
      "anonymous resources",
      "contained resources"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "DomainResource.contained",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Resource"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.extension",
      "path" : "SubstancePolymer.extension",
      "short" : "Additional content defined by implementations",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the resource. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "alias" : ["extensions",
      "user content"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "DomainResource.extension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.modifierExtension",
      "path" : "SubstancePolymer.modifierExtension",
      "short" : "Extensions that cannot be ignored",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the resource and that modifies the understanding of the element that contains it and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.\n\nModifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "requirements" : "Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](extensibility.html#modifierExtension).",
      "alias" : ["extensions",
      "user content"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "DomainResource.modifierExtension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : true,
      "isModifierReason" : "Modifier extensions are expected to modify the meaning or interpretation of the resource that contains them",
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.identifier",
      "path" : "SubstancePolymer.identifier",
      "short" : "A business idenfier for this polymer, but typically this is handled by a SubstanceDefinition identifier",
      "definition" : "A business idenfier for this polymer, but typically this is handled by a SubstanceDefinition identifier.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.identifier",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "Identifier"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {

      "id" : "SubstancePolymer.class",
      "path" : "SubstancePolymer.class",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Overall type of the polymer",
      "definition" : "Overall type of the polymer.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.class",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.geometry",
      "path" : "SubstancePolymer.geometry",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Polymer geometry, e.g. linear, branched, cross-linked, network or dendritic",
      "definition" : "Polymer geometry, e.g. linear, branched, cross-linked, network or dendritic.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.geometry",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.copolymerConnectivity",
      "path" : "SubstancePolymer.copolymerConnectivity",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Descrtibes the copolymer sequence type (polymer connectivity)",
      "definition" : "Descrtibes the copolymer sequence type (polymer connectivity).",

      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "SubstancePolymer.copolymerConnectivity",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.modification",
      "path" : "SubstancePolymer.modification",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Todo - this is intended to connect to a repeating full modification structure, also used by Protein and Nucleic Acid . String is just a placeholder",
      "definition" : "Todo - this is intended to connect to a repeating full modification structure, also used by Protein and Nucleic Acid . String is just a placeholder.",

      "min" : 0,
      "max" : "*",

      "max" : "1",

      "base" : {
        "path" : "SubstancePolymer.modification",
        "min" : 0,
        "max" : "*"

        "max" : "1"

      },
      "type" : [{
        "code" : "string"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet",
      "path" : "SubstancePolymer.monomerSet",
      "short" : "Todo",
      "definition" : "Todo.",
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "SubstancePolymer.monomerSet",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "BackboneElement"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.id",
      "path" : "SubstancePolymer.monomerSet.id",
      "representation" : ["xmlAttr"],
      "short" : "Unique id for inter-element referencing",
      "definition" : "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Element.id",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl" : "string"

          "valueUri" : "id"

        }],
        "code" : "http://hl7.org/fhirpath/System.String"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.monomerSet.extension",
      "path" : "SubstancePolymer.monomerSet.extension",
      "short" : "Additional content defined by implementations",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "alias" : ["extensions",
      "user content"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "Element.extension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.monomerSet.modifierExtension",
      "path" : "SubstancePolymer.monomerSet.modifierExtension",
      "short" : "Extensions that cannot be ignored even if unrecognized",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.\n\nModifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "requirements" : "Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](extensibility.html#modifierExtension).",
      "alias" : ["extensions",
      "user content",
      "modifiers"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "BackboneElement.modifierExtension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : true,
      "isModifierReason" : "Modifier extensions are expected to modify the meaning or interpretation of the element that contains them",
      "isSummary" : true,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.monomerSet.ratioType",
      "path" : "SubstancePolymer.monomerSet.ratioType",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Captures the type of ratio to the entire polymer, e.g. Monomer/Polymer ratio, SRU/Polymer Ratio",
      "definition" : "Captures the type of ratio to the entire polymer, e.g. Monomer/Polymer ratio, SRU/Polymer Ratio.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.monomerSet.ratioType",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial",
      "path" : "SubstancePolymer.monomerSet.startingMaterial",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "The starting materials - monomer(s) used in the synthesis of the polymer",
      "definition" : "The starting materials - monomer(s) used in the synthesis of the polymer.",

      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "SubstancePolymer.monomerSet.startingMaterial",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "BackboneElement"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.id",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.id",
      "representation" : ["xmlAttr"],
      "short" : "Unique id for inter-element referencing",
      "definition" : "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Element.id",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl" : "string"

          "valueUri" : "id"

        }],
        "code" : "http://hl7.org/fhirpath/System.String"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.extension",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.extension",
      "short" : "Additional content defined by implementations",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "alias" : ["extensions",
      "user content"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "Element.extension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.modifierExtension",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.modifierExtension",
      "short" : "Extensions that cannot be ignored even if unrecognized",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.\n\nModifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "requirements" : "Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](extensibility.html#modifierExtension).",
      "alias" : ["extensions",
      "user content",
      "modifiers"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "BackboneElement.modifierExtension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : true,
      "isModifierReason" : "Modifier extensions are expected to modify the meaning or interpretation of the element that contains them",
      "isSummary" : true,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.material",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.material",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.monomerSet.startingMaterial.code",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.code",
      "short" : "The type of substance for this starting material",
      "definition" : "The type of substance for this starting material.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.monomerSet.startingMaterial.material",

        "path" : "SubstancePolymer.monomerSet.startingMaterial.code",

        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.type",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.type",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.monomerSet.startingMaterial.category",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.category",
      "short" : "Substance high level category, e.g. chemical substance",
      "definition" : "Substance high level category, e.g. chemical substance.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.monomerSet.startingMaterial.type",

        "path" : "SubstancePolymer.monomerSet.startingMaterial.category",

        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.isDefining",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.isDefining",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Used to specify whether the attribute described is a defining element for the unique identification of the polymer",
      "definition" : "Used to specify whether the attribute described is a defining element for the unique identification of the polymer.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.monomerSet.startingMaterial.isDefining",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "boolean"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.amount",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.amount",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "A percentage",
      "definition" : "A percentage.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.monomerSet.startingMaterial.amount",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "SubstanceAmount"

        "code" : "Quantity"

      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat",
      "path" : "SubstancePolymer.repeat",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Specifies and quantifies the repeated units and their configuration",
      "definition" : "Specifies and quantifies the repeated units and their configuration.",

      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "SubstancePolymer.repeat",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "BackboneElement"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.id",
      "path" : "SubstancePolymer.repeat.id",
      "representation" : ["xmlAttr"],
      "short" : "Unique id for inter-element referencing",
      "definition" : "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Element.id",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl" : "string"

          "valueUri" : "id"

        }],
        "code" : "http://hl7.org/fhirpath/System.String"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.extension",
      "path" : "SubstancePolymer.repeat.extension",
      "short" : "Additional content defined by implementations",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "alias" : ["extensions",
      "user content"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "Element.extension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.modifierExtension",
      "path" : "SubstancePolymer.repeat.modifierExtension",
      "short" : "Extensions that cannot be ignored even if unrecognized",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.\n\nModifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "requirements" : "Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](extensibility.html#modifierExtension).",
      "alias" : ["extensions",
      "user content",
      "modifiers"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "BackboneElement.modifierExtension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : true,
      "isModifierReason" : "Modifier extensions are expected to modify the meaning or interpretation of the element that contains them",
      "isSummary" : true,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.numberOfUnits",
      "path" : "SubstancePolymer.repeat.numberOfUnits",
      "short" : "Todo",
      "definition" : "Todo.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.numberOfUnits",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "integer"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {

      "id" : "SubstancePolymer.repeat.averageMolecularFormula",
      "path" : "SubstancePolymer.repeat.averageMolecularFormula",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "A representation of an (average) molecular formula from a polymer",
      "definition" : "A representation of an (average) molecular formula from a polymer.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.averageMolecularFormula",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "string"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnitAmountType",
      "path" : "SubstancePolymer.repeat.repeatUnitAmountType",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "How the quantitative amount of Structural Repeat Units is captured (e.g. Exact, Numeric, Average)",
      "definition" : "How the quantitative amount of Structural Repeat Units is captured (e.g. Exact, Numeric, Average).",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnitAmountType",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit",
      "path" : "SubstancePolymer.repeat.repeatUnit",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "An SRU - Structural Repeat Unit",
      "definition" : "An SRU - Structural Repeat Unit.",

      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "BackboneElement"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.id",
      "path" : "SubstancePolymer.repeat.repeatUnit.id",
      "representation" : ["xmlAttr"],
      "short" : "Unique id for inter-element referencing",
      "definition" : "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Element.id",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl" : "string"

          "valueUri" : "id"

        }],
        "code" : "http://hl7.org/fhirpath/System.String"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.extension",
      "path" : "SubstancePolymer.repeat.repeatUnit.extension",
      "short" : "Additional content defined by implementations",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "alias" : ["extensions",
      "user content"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "Element.extension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.modifierExtension",
      "path" : "SubstancePolymer.repeat.repeatUnit.modifierExtension",
      "short" : "Extensions that cannot be ignored even if unrecognized",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.\n\nModifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "requirements" : "Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](extensibility.html#modifierExtension).",
      "alias" : ["extensions",
      "user content",
      "modifiers"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "BackboneElement.modifierExtension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : true,
      "isModifierReason" : "Modifier extensions are expected to modify the meaning or interpretation of the element that contains them",
      "isSummary" : true,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.orientationOfPolymerisation",
      "path" : "SubstancePolymer.repeat.repeatUnit.orientationOfPolymerisation",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.repeat.repeatUnit.unit",
      "path" : "SubstancePolymer.repeat.repeatUnit.unit",
      "short" : "Structural repeat units are essential elements for defining polymers",
      "definition" : "Structural repeat units are essential elements for defining polymers.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.orientationOfPolymerisation",

        "path" : "SubstancePolymer.repeat.repeatUnit.unit",

        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"

        "code" : "string"

      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.repeatUnit",
      "path" : "SubstancePolymer.repeat.repeatUnit.repeatUnit",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.repeat.repeatUnit.orientation",
      "path" : "SubstancePolymer.repeat.repeatUnit.orientation",
      "short" : "The orientation of the polymerisation, e.g. head-tail, head-head, random",
      "definition" : "The orientation of the polymerisation, e.g. head-tail, head-head, random.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.repeatUnit",

        "path" : "SubstancePolymer.repeat.repeatUnit.orientation",

        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "string"

        "code" : "CodeableConcept"

      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.amount",
      "path" : "SubstancePolymer.repeat.repeatUnit.amount",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Number of repeats of this unit",
      "definition" : "Number of repeats of this unit.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.amount",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "SubstanceAmount"

        "code" : "integer"

      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Applies to homopolymer and block co-polymers where the degree of polymerisation within a block can be described",
      "definition" : "Applies to homopolymer and block co-polymers where the degree of polymerisation within a block can be described.",

      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "BackboneElement"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.id",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.id",
      "representation" : ["xmlAttr"],
      "short" : "Unique id for inter-element referencing",
      "definition" : "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Element.id",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl" : "string"

          "valueUri" : "id"

        }],
        "code" : "http://hl7.org/fhirpath/System.String"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.extension",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.extension",
      "short" : "Additional content defined by implementations",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "alias" : ["extensions",
      "user content"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "Element.extension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.modifierExtension",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.modifierExtension",
      "short" : "Extensions that cannot be ignored even if unrecognized",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.\n\nModifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "requirements" : "Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](extensibility.html#modifierExtension).",
      "alias" : ["extensions",
      "user content",
      "modifiers"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "BackboneElement.modifierExtension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : true,
      "isModifierReason" : "Modifier extensions are expected to modify the meaning or interpretation of the element that contains them",
      "isSummary" : true,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.degree",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.degree",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.type",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.type",
      "short" : "The type of the degree of polymerisation shall be described, e.g. SRU/Polymer Ratio",
      "definition" : "The type of the degree of polymerisation shall be described, e.g. SRU/Polymer Ratio.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.degree",

        "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.type",

        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.amount",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.amount",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.average",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.average",
      "short" : "An average amount of polymerisation",
      "definition" : "An average amount of polymerisation.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.amount",

        "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.average",

        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "SubstanceAmount"

        "code" : "integer"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.low",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.low",
      "short" : "A low expected limit of the amount",
      "definition" : "A low expected limit of the amount.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.low",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "integer"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.high",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.high",
      "short" : "A high expected limit of the amount",
      "definition" : "A high expected limit of the amount.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.high",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "integer"

      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "A graphical structure for this SRU",
      "definition" : "A graphical structure for this SRU.",

      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "BackboneElement"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.id",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.id",
      "representation" : ["xmlAttr"],
      "short" : "Unique id for inter-element referencing",
      "definition" : "Unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "Element.id",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "extension" : [{
          "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fhir-type",
          "valueUrl" : "string"

          "valueUri" : "id"

        }],
        "code" : "http://hl7.org/fhirpath/System.String"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.extension",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.extension",
      "short" : "Additional content defined by implementations",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element. To make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension.",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "alias" : ["extensions",
      "user content"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "Element.extension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : false,
      "isSummary" : false,
      "mapping" : [{
        "identity" : "rim",
        "map" : "n/a"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.modifierExtension",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.modifierExtension",
      "short" : "Extensions that cannot be ignored even if unrecognized",
      "definition" : "May be used to represent additional information that is not part of the basic definition of the element and that modifies the understanding of the element in which it is contained and/or the understanding of the containing element's descendants. Usually modifier elements provide negation or qualification. To make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer can define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions.\n\nModifier extensions SHALL NOT change the meaning of any elements on Resource or DomainResource (including cannot change the meaning of modifierExtension itself).",
      "comment" : "There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone.",
      "requirements" : "Modifier extensions allow for extensions that *cannot* be safely ignored to be clearly distinguished from the vast majority of extensions which can be safely ignored.  This promotes interoperability by eliminating the need for implementers to prohibit the presence of extensions. For further information, see the [definition of modifier extensions](extensibility.html#modifierExtension).",
      "alias" : ["extensions",
      "user content",
      "modifiers"],
      "min" : 0,
      "max" : "*",
      "base" : {
        "path" : "BackboneElement.modifierExtension",
        "min" : 0,
        "max" : "*"
      },
      "type" : [{
        "code" : "Extension"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      },
      {
        "key" : "ext-1",
        "severity" : "error",
        "human" : "Must have either extensions or value[x], not both",
        "expression" : "extension.exists() != value.exists()",
        "xpath" : "exists(f:extension)!=exists(f:*[starts-with(local-name(.), \"value\")])",
        "source" : "http://hl7.org/fhir/StructureDefinition/Extension"
      }],
      "isModifier" : true,
      "isModifierReason" : "Modifier extensions are expected to modify the meaning or interpretation of the element that contains them",
      "isSummary" : true,
      "mapping" : [{
        "identity" : "rim",
        "map" : "N/A"
      }]
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.type",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.type",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "The type of structure (e.g. Full, Partial, Representative)",
      "definition" : "The type of structure (e.g. Full, Partial, Representative).",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.type",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.representation",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.representation",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "The structural representation as text string in a standard format e.g. InChI, SMILES, MOLFILE, CDX, SDF, PDB, mmCIF",
      "definition" : "The structural representation as text string in a standard format e.g. InChI, SMILES, MOLFILE, CDX, SDF, PDB, mmCIF.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.representation",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "string"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.format",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.format",
      "short" : "The format of the representation e.g. InChI, SMILES, MOLFILE, CDX, SDF, PDB, mmCIF",
      "definition" : "The format of the representation e.g. InChI, SMILES, MOLFILE, CDX, SDF, PDB, mmCIF.",
      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.format",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    },
    {

      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.attachment",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.attachment",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "An attached file with the structural representation",
      "definition" : "An attached file with the structural representation.",

      "min" : 0,
      "max" : "1",
      "base" : {
        "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.attachment",
        "min" : 0,
        "max" : "1"
      },
      "type" : [{
        "code" : "Attachment"
      }],
      "constraint" : [{
        "key" : "ele-1",
        "severity" : "error",
        "human" : "All FHIR elements must have a @value or children",
        "expression" : "hasValue() or (children().count() > id.count())",
        "xpath" : "@value|f:*|h:div",
        "source" : "http://hl7.org/fhir/StructureDefinition/Element"
      }],
      "isModifier" : false,
      "isSummary" : true
    }]
  },
  "differential" : {
    "element" : [{
      "id" : "SubstancePolymer",
      "path" : "SubstancePolymer",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Properties of a substance specific to it being a polymer",
      "definition" : "Properties of a substance specific to it being a polymer.",

      "min" : 0,
      "max" : "*"
    },
    {
      "id" : "SubstancePolymer.identifier",
      "path" : "SubstancePolymer.identifier",
      "short" : "A business idenfier for this polymer, but typically this is handled by a SubstanceDefinition identifier",
      "definition" : "A business idenfier for this polymer, but typically this is handled by a SubstanceDefinition identifier.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "Identifier"
      }],
      "isSummary" : true
    },
    {

      "id" : "SubstancePolymer.class",
      "path" : "SubstancePolymer.class",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Overall type of the polymer",
      "definition" : "Overall type of the polymer.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.geometry",
      "path" : "SubstancePolymer.geometry",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Polymer geometry, e.g. linear, branched, cross-linked, network or dendritic",
      "definition" : "Polymer geometry, e.g. linear, branched, cross-linked, network or dendritic.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.copolymerConnectivity",
      "path" : "SubstancePolymer.copolymerConnectivity",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Descrtibes the copolymer sequence type (polymer connectivity)",
      "definition" : "Descrtibes the copolymer sequence type (polymer connectivity).",

      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.modification",
      "path" : "SubstancePolymer.modification",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Todo - this is intended to connect to a repeating full modification structure, also used by Protein and Nucleic Acid . String is just a placeholder",
      "definition" : "Todo - this is intended to connect to a repeating full modification structure, also used by Protein and Nucleic Acid . String is just a placeholder.",

      "min" : 0,
      "max" : "*",

      "max" : "1",

      "type" : [{
        "code" : "string"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet",
      "path" : "SubstancePolymer.monomerSet",
      "short" : "Todo",
      "definition" : "Todo.",
      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "BackboneElement"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.ratioType",
      "path" : "SubstancePolymer.monomerSet.ratioType",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Captures the type of ratio to the entire polymer, e.g. Monomer/Polymer ratio, SRU/Polymer Ratio",
      "definition" : "Captures the type of ratio to the entire polymer, e.g. Monomer/Polymer ratio, SRU/Polymer Ratio.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial",
      "path" : "SubstancePolymer.monomerSet.startingMaterial",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "The starting materials - monomer(s) used in the synthesis of the polymer",
      "definition" : "The starting materials - monomer(s) used in the synthesis of the polymer.",

      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "BackboneElement"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.material",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.material",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.monomerSet.startingMaterial.code",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.code",
      "short" : "The type of substance for this starting material",
      "definition" : "The type of substance for this starting material.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.type",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.type",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.monomerSet.startingMaterial.category",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.category",
      "short" : "Substance high level category, e.g. chemical substance",
      "definition" : "Substance high level category, e.g. chemical substance.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.isDefining",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.isDefining",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Used to specify whether the attribute described is a defining element for the unique identification of the polymer",
      "definition" : "Used to specify whether the attribute described is a defining element for the unique identification of the polymer.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "boolean"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.monomerSet.startingMaterial.amount",
      "path" : "SubstancePolymer.monomerSet.startingMaterial.amount",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "A percentage",
      "definition" : "A percentage.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "SubstanceAmount"

        "code" : "Quantity"

      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat",
      "path" : "SubstancePolymer.repeat",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Specifies and quantifies the repeated units and their configuration",
      "definition" : "Specifies and quantifies the repeated units and their configuration.",

      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "BackboneElement"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.numberOfUnits",
      "path" : "SubstancePolymer.repeat.numberOfUnits",
      "short" : "Todo",
      "definition" : "Todo.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "integer"
      }],
      "isSummary" : true
    },
    {

      "id" : "SubstancePolymer.repeat.averageMolecularFormula",
      "path" : "SubstancePolymer.repeat.averageMolecularFormula",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "A representation of an (average) molecular formula from a polymer",
      "definition" : "A representation of an (average) molecular formula from a polymer.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "string"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnitAmountType",
      "path" : "SubstancePolymer.repeat.repeatUnitAmountType",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "How the quantitative amount of Structural Repeat Units is captured (e.g. Exact, Numeric, Average)",
      "definition" : "How the quantitative amount of Structural Repeat Units is captured (e.g. Exact, Numeric, Average).",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit",
      "path" : "SubstancePolymer.repeat.repeatUnit",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "An SRU - Structural Repeat Unit",
      "definition" : "An SRU - Structural Repeat Unit.",

      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "BackboneElement"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.orientationOfPolymerisation",
      "path" : "SubstancePolymer.repeat.repeatUnit.orientationOfPolymerisation",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.repeat.repeatUnit.unit",
      "path" : "SubstancePolymer.repeat.repeatUnit.unit",
      "short" : "Structural repeat units are essential elements for defining polymers",
      "definition" : "Structural repeat units are essential elements for defining polymers.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"

        "code" : "string"

      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.repeatUnit",
      "path" : "SubstancePolymer.repeat.repeatUnit.repeatUnit",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.repeat.repeatUnit.orientation",
      "path" : "SubstancePolymer.repeat.repeatUnit.orientation",
      "short" : "The orientation of the polymerisation, e.g. head-tail, head-head, random",
      "definition" : "The orientation of the polymerisation, e.g. head-tail, head-head, random.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "string"

        "code" : "CodeableConcept"

      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.amount",
      "path" : "SubstancePolymer.repeat.repeatUnit.amount",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Number of repeats of this unit",
      "definition" : "Number of repeats of this unit.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "SubstanceAmount"

        "code" : "integer"

      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "Applies to homopolymer and block co-polymers where the degree of polymerisation within a block can be described",
      "definition" : "Applies to homopolymer and block co-polymers where the degree of polymerisation within a block can be described.",

      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "BackboneElement"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.degree",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.degree",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.type",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.type",
      "short" : "The type of the degree of polymerisation shall be described, e.g. SRU/Polymer Ratio",
      "definition" : "The type of the degree of polymerisation shall be described, e.g. SRU/Polymer Ratio.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.amount",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.amount",
      "short" : "Todo",
      "definition" : "Todo.",

      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.average",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.average",
      "short" : "An average amount of polymerisation",
      "definition" : "An average amount of polymerisation.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "SubstanceAmount"

        "code" : "integer"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.low",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.low",
      "short" : "A low expected limit of the amount",
      "definition" : "A low expected limit of the amount.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "integer"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.high",
      "path" : "SubstancePolymer.repeat.repeatUnit.degreeOfPolymerisation.high",
      "short" : "A high expected limit of the amount",
      "definition" : "A high expected limit of the amount.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "integer"

      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "A graphical structure for this SRU",
      "definition" : "A graphical structure for this SRU.",

      "min" : 0,
      "max" : "*",
      "type" : [{
        "code" : "BackboneElement"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.type",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.type",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "The type of structure (e.g. Full, Partial, Representative)",
      "definition" : "The type of structure (e.g. Full, Partial, Representative).",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.representation",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.representation",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "The structural representation as text string in a standard format e.g. InChI, SMILES, MOLFILE, CDX, SDF, PDB, mmCIF",
      "definition" : "The structural representation as text string in a standard format e.g. InChI, SMILES, MOLFILE, CDX, SDF, PDB, mmCIF.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "string"
      }],
      "isSummary" : true
    },
    {
      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.format",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.format",
      "short" : "The format of the representation e.g. InChI, SMILES, MOLFILE, CDX, SDF, PDB, mmCIF",
      "definition" : "The format of the representation e.g. InChI, SMILES, MOLFILE, CDX, SDF, PDB, mmCIF.",
      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "CodeableConcept"
      }],
      "isSummary" : true
    },
    {

      "id" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.attachment",
      "path" : "SubstancePolymer.repeat.repeatUnit.structuralRepresentation.attachment",
      "short" : "Todo",
      "definition" : "Todo.",

      "short" : "An attached file with the structural representation",
      "definition" : "An attached file with the structural representation.",

      "min" : 0,
      "max" : "1",
      "type" : [{
        "code" : "Attachment"
      }],
      "isSummary" : true
    }]
  }
}

Usage note: every effort has been made to ensure that the examples are correct and useful, but they are not a normative part of the specification.