description: Variable specifying a logic to generate a variable for use in subsequent logic.  The name of the variable will be added to FHIRPath's context when processing descendants of the element that contains this extension as well as extensions within the same element.
package_name: hl7.fhir.uv.extensions.r3
derivation: constraint
name: Variable
type: Extension
elements:
  extension:
    array: true
    index: 0
    slicing:
      rules: open
      ordered: false
      discriminator:
      - {path: url, type: value}
      min: null
      slices:
        _datatype:
          match: {url: null}
          schema:
            type: Extension
            short: DataType name 'Expression' from R5
            url: h
            index: 1
            elements:
              value:
                pattern: {type: String, value: Expression}
                choices: [valueString]
                index: 3
              valueString:
                type: string
                pattern: {type: String, value: Expression}
                choiceOf: value
                index: 4
            required: [valueString, value]
        description:
          match: {url: description}
          schema:
            short: Natural language description of the condition
            index: 5
            extensions: {}
            elements:
              extension: {index: 6}
              url:
                pattern: {type: Uri, value: description}
                index: 7
              value:
                choices: [valueString]
                index: 9
              valueString: {type: string, choiceOf: value, index: 10}
            required: [valueString, value]
        name:
          match: {url: name}
          schema:
            short: Short name assigned to expression for reuse
            index: 11
            extensions: {}
            elements:
              extension: {index: 12}
              url:
                pattern: {type: Uri, value: name}
                index: 13
              value:
                choices: [valueCode]
                index: 15
              valueCode: {type: code, choiceOf: value, index: 16}
            required: [valueCode, value]
        language:
          match: {url: language}
          schema:
            short: text/cql | text/fhirpath | application/x-fhir-query | etc.
            index: 17
            extensions: {}
            elements:
              extension: {index: 18}
              url:
                pattern: {type: Uri, value: language}
                index: 19
              value:
                choices: [valueCode]
                index: 21
              valueCode: {type: code, choiceOf: value, index: 22}
            required: [valueCode, value]
        expression:
          match: {url: expression}
          schema:
            short: Expression in specified language
            index: 23
            extensions: {}
            elements:
              extension: {index: 24}
              url:
                pattern: {type: Uri, value: expression}
                index: 25
              value:
                choices: [valueString]
                index: 27
              valueString: {type: string, choiceOf: value, index: 28}
            required: [valueString, value]
        reference:
          match: {url: reference}
          schema:
            short: Where the expression is found
            index: 29
            extensions: {}
            elements:
              extension: {index: 30}
              url:
                pattern: {type: Uri, value: reference}
                index: 31
              value:
                choices: [valueUri]
                index: 33
              valueUri: {type: uri, choiceOf: value, index: 34}
            required: [valueUri, value]
  url:
    pattern: {type: Uri, value: 'http://hl7.org/fhir/StructureDefinition/variable'}
    index: 35
  value:
    choices: []
    index: 37
package_version: 5.3.0-ballot-tc1
extensions:
  _datatype:
    url: h
    type: Extension
    short: DataType name 'Expression' from R5
    index: 1
    elements:
      value:
        pattern: {type: String, value: Expression}
        choices: [valueString]
        index: 3
      valueString:
        type: string
        pattern: {type: String, value: Expression}
        choiceOf: value
        index: 4
    required: [valueString, value]
  description:
    url: description
    short: Natural language description of the condition
    index: 5
    extensions: {}
    elements:
      extension: {index: 6}
      url:
        pattern: {type: Uri, value: description}
        index: 7
      value:
        choices: [valueString]
        index: 9
      valueString: {type: string, choiceOf: value, index: 10}
    required: [valueString, value]
  name:
    url: name
    short: Short name assigned to expression for reuse
    index: 11
    extensions: {}
    elements:
      extension: {index: 12}
      url:
        pattern: {type: Uri, value: name}
        index: 13
      value:
        choices: [valueCode]
        index: 15
      valueCode: {type: code, choiceOf: value, index: 16}
    required: [valueCode, value]
  language:
    url: language
    short: text/cql | text/fhirpath | application/x-fhir-query | etc.
    index: 17
    extensions: {}
    elements:
      extension: {index: 18}
      url:
        pattern: {type: Uri, value: language}
        index: 19
      value:
        choices: [valueCode]
        index: 21
      valueCode: {type: code, choiceOf: value, index: 22}
    required: [valueCode, value]
  expression:
    url: expression
    short: Expression in specified language
    index: 23
    extensions: {}
    elements:
      extension: {index: 24}
      url:
        pattern: {type: Uri, value: expression}
        index: 25
      value:
        choices: [valueString]
        index: 27
      valueString: {type: string, choiceOf: value, index: 28}
    required: [valueString, value]
  reference:
    url: reference
    short: Where the expression is found
    index: 29
    extensions: {}
    elements:
      extension: {index: 30}
      url:
        pattern: {type: Uri, value: reference}
        index: 31
      value:
        choices: [valueUri]
        index: 33
      valueUri: {type: uri, choiceOf: value, index: 34}
    required: [valueUri, value]
class: extension
kind: complex-type
url: http://hl7.org/fhir/StructureDefinition/variable
base: http://hl7.org/fhir/StructureDefinition/Extension
version: 5.3.0-ballot-tc1