http://hl7.org/fhir/filter-operator|4.0.1

{
  "description" : "The kind of operation to perform as a part of a property based filter.",
  "compose" : null,
  "package" : "hl7.fhir.r4.core@4.0.1",
  "date" : "2019-10-31T22:29:23Z",
  "meta" : {
    "lastUpdated" : "2019-11-01T09:29:23.356+11:00"
  },
  "publisher" : "HL7 (FHIR Project)",
  "content" : "complete",
  "name" : "FilterOperator",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "FilterOperator",
  "supliment" : null,
  "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
  } ],
  "status" : "active",
  "id" : "841c428b-122e-5290-987c-c8363c863331",
  "valueSet" : "http://hl7.org/fhir/ValueSet/filter-operator",
  "url" : "http://hl7.org/fhir/filter-operator",
  "identifier" : [ {
    "value" : "urn:oid:2.16.840.1.113883.4.642.4.479",
    "system" : "urn:ietf:rfc:3986"
  } ],
  "concept" : [ {
    "code" : "=",
    "display" : "Equals",
    "definition" : "The specified property of the code equals the provided value."
  }, {
    "code" : "is-a",
    "display" : "Is A (by subsumption)",
    "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"
    } ],
    "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)",
    "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"
    } ],
    "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)",
    "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"
    } ],
    "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)."
  } ],
  "caseSensitive" : true,
  "version" : "4.0.1",
  "contact" : [ {
    "telecom" : [ {
      "value" : "http://hl7.org/fhir",
      "system" : "url"
    }, {
      "value" : "fhir@lists.hl7.org",
      "system" : "email"
    } ]
  } ]
}