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Source1

{
  "resourceType": "CodeSystem",
  "id": "filter-operator",
  "text": {
    "status": "generated",
    "div": "<!-- snip (see above) -->"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
      "valueCode": "normative"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-normative-version",
      "valueCode": "4.0.0"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger": 5
    },
    {
      "extension": [
        {
          "url": "packageId",
          "valueId": "hl7.fhir.uv.xver-r4.r4b"
        },
        {
          "url": "version",
          "valueString": "0.0.1-snapshot-2"
        }
      ],
      "url": "http://hl7.org/fhir/StructureDefinition/package-source"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
      "valueCode": "vocab"
    }
  ],
  "url": "http://hl7.org/fhir/filter-operator",
  "version": "4.0.1",
  "name": "FilterOperator",
  "title": "FilterOperator",
  "status": "active",
  "experimental": false,
  "date": "2019-11-01T08:29:23+10:00",
  "publisher": "HL7 International / Terminology Infrastructure",
  "contact": [
    {
      "name": "HL7 International / Terminology Infrastructure",
      "telecom": [
        {
          "system": "url",
          "value": "http://www.hl7.org/Special/committees/Vocab"
        }
      ]
    }
  ],
  "description": "The kind of operation to perform as a part of a property based filter.",
  "jurisdiction": [
    {
      "coding": [
        {
          "system": "http://unstats.un.org/unsd/methods/m49/m49.htm",
          "code": "001",
          "display": "World"
        }
      ]
    }
  ],
  "caseSensitive": true,
  "valueSet": "http://hl7.org/fhir/ValueSet/filter-operator|4.3.0",
  "content": "complete",
  "concept": [
    {
      "code": "=",
      "display": "Equals",
      "definition": "The specified property of the code equals the provided value."
    },
    {
      "code": "is-a",
      "display": "Is A (by subsumption)",
      "definition": "Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value, including the provided concept itself (include descendant codes and self)."
    },
    {
      "code": "descendent-of",
      "display": "Descendent Of (by subsumption)",
      "definition": "Includes all concept ids that have a transitive is-a relationship with the concept Id provided as the value, excluding the provided concept itself i.e. include descendant codes only)."
    },
    {
      "code": "is-not-a",
      "display": "Not (Is A) (by subsumption)",
      "definition": "The specified property of the code does not have an is-a relationship with the provided value."
    },
    {
      "code": "regex",
      "display": "Regular Expression",
      "definition": "The specified property of the code  matches the regex specified in the provided value."
    },
    {
      "code": "in",
      "display": "In Set",
      "definition": "The specified property of the code is in the set of codes or concepts specified in the provided value (comma separated list)."
    },
    {
      "code": "not-in",
      "display": "Not in Set",
      "definition": "The specified property of the code is not in the set of codes or concepts specified in the provided value (comma separated list)."
    },
    {
      "code": "generalizes",
      "display": "Generalizes (by Subsumption)",
      "definition": "Includes all concept ids that have a transitive is-a relationship from the concept Id provided as the value, including the provided concept itself (i.e. include ancestor codes and self)."
    },
    {
      "code": "exists",
      "display": "Exists",
      "definition": "The specified property of the code has at least one value (if the specified value is true; if the specified value is false, then matches when the specified property of the code has no values)."
    }
  ]
}