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This is the Continuous Integration Build of FHIR (will be incorrect/inconsistent at times).
See the Directory of published versions

Example SearchParameter/example-extension (JSON)

FHIR Infrastructure Work GroupMaturity Level: N/AStandards Status: InformativeCompartments: No defined compartments

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

Search parameter for an extension example

{
  "resourceType" : "SearchParameter",
  "id" : "example-extension",
  "extension" : [{
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode" : "fhir"
  }],
  "url" : "http://hl7.org/fhir/SearchParameter/example-extension",
  "name" : "ExampleSearchParameterOnAnExtension",
  "title" : "Example Search Parameter on an extension",
  "status" : "draft",
  "experimental" : true,
  "publisher" : "HL7 International / FHIR Infrastructure",
  "contact" : [{
    "telecom" : [{
      "system" : "url",
      "value" : "http://www.hl7.org/Special/committees/fiwg"
    }]
  }],
  "description" : "Search by url for a participation agreement, which is stored as an extension referencing a DocumentReference",
  "code" : "part-agree",
  "base" : ["Patient"],
  "type" : "reference",
  "expression" : "Patient.extension('http://example.org/fhir/StructureDefinition/participation-agreement').value",
  "processingMode" : "normal",
  "target" : ["DocumentReference"]
}

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.