{

"resourceType": "CodeSystem",
"id": "filter-operator",
"meta": {
  "lastUpdated": "2019-11-01T09:29:23.356+11:00"
},
"extension": [
  {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode": "vocab"
  },
  {
    "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
  }
],
"url": "http://hl7.org/fhir/filter-operator",
"identifier": [
  {
    "system": "urn:ietf:rfc:3986",
    "value": "urn:oid:2.16.840.1.113883.4.642.4.479"
  }
],
"version": "4.0.1",
"name": "FilterOperator",
"title": "FilterOperator",
"status": "active",
"experimental": false,
"date": "2019-11-01T09:29:23+11:00",
"publisher": "HL7 (FHIR Project)",
"contact": [
  {
    "telecom": [
      {
        "system": "url",
        "value": "http://hl7.org/fhir"
      },
      {
        "system": "email",
        "value": "fhir@lists.hl7.org"
      }
    ]
  }
],
"description": "The kind of operation to perform as a part of a property based filter.",
"caseSensitive": true,
"valueSet": "http://hl7.org/fhir/ValueSet/filter-operator",
"content": "complete",
"concept": [
  {
    "code": "=",
    "display": "Equals",
    "definition": "The specified property of the code equals the provided value."
  },
  {
    "extension": [
      {
        "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
        "valueString": "The definition of is-a is that all the properties of the value are true for the specified property of the code, which means that a code has an is-a relationship with itself. To exclude the root code, use descendent-of"
      }
    ],
    "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)."
  },
  {
    "extension": [
      {
        "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
        "valueString": "The definition of is-a is that all the properties of the value are true for the specified property of the code. \n\nSpelling note: \"descendant\" is a more correct spelling, but the spelling \"descendent\" is maintained in the code for backwards compatibility reasons"
      }
    ],
    "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)."
  },
  {
    "extension": [
      {
        "url": "http://hl7.org/fhir/StructureDefinition/codesystem-concept-comments",
        "valueString": "The definition of is-a is that all the properties of the value are true for the specified property of the code, which means that a code has an is-a relationship with itself. To exclude the root code, add it explicitly to as an exclude"
      }
    ],
    "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)."
  }
]

}