Cross-Version Extension for Expression.language in R4B

Context of Use

This extension may be used in the following contexts:

Name	Flags	Card.	Type	Description & Constraints
Extension		1..1	Extension	text/cql | text/fhirpath | application/x-fhir-query | text/cql-identifier | text/cql-expression | etc.
extension		..0
value[x]		1..	code
url				"http://hl7.org/fhir/4.3/StructureDefinition/extension-Expression.language"
Documentation for this format

{
  "resourceType" : "StructureDefinition",
  "id" : "xv-r4b-exp.language",
  "url" : "http://hl7.org/fhir/4.3/StructureDefinition/extension-Expression.language",
  "name" : "XVerExtensionExpression.languageR4B",
  "title" : "Cross-Version Extension for Expression.language in R4B",
  "status" : "active",
  "experimental" : false,
  "publisher" : "HL7 FHIR Standard",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://hl7.org/fhir"
    }]
  }],
  "description" : "Cross-Version Extension for Expression.language. Valid in versions R4\r\n\r\nThis is a valid extension because it has the following codes that are not in other versions text/cql-expression, text/cql-identifier (http://hl7.org/fhir/4.3/expression-language)",
  "jurisdiction" : [{
    "coding" : [{
      "system" : "http://unstats.un.org/unsd/methods/m49/m49.htm",
      "code" : "001"
    }]
  }],
  "fhirVersion" : "5.0.0",
  "kind" : "complex-type",
  "abstract" : false,
  "type" : "Extension",
  "baseDefinition" : "http://hl7.org/fhir/StructureDefinition/Extension",
  "derivation" : "constraint",
  "differential" : {
    "element" : [{
      "path" : "Extension",
      "short" : "text/cql | text/fhirpath | application/x-fhir-query | text/cql-identifier | text/cql-expression | etc.",
      "definition" : "The media type of the language for the expression.",
      "min" : 1,
      "max" : "1",
      "isModifier" : false
    },
    {
      "path" : "Extension.extension",
      "max" : "0"
    },
    {
      "path" : "Extension.value[x]",
      "min" : 1,
      "type" : [{
        "code" : "code"
      }]
    },
    {
      "path" : "Extension.url",
      "fixedUri" : "http://hl7.org/fhir/4.3/StructureDefinition/extension-Expression.language"
    }]
  }
}