http://terminology.hl7.org/CodeSystem/v3-ResponseMode|2018-08-12

{
  "description" : " Specifies the mode, immediate versus deferred or queued, by which a receiver should communicate its receiver responsibilities.",
  "compose" : null,
  "package" : "hl7.fhir.r4.core@4.0.1",
  "date" : "2018-08-11T14:00:00Z",
  "meta" : {
    "lastUpdated" : "2018-08-12T00:00:00.000+10:00"
  },
  "publisher" : "HL7, Inc",
  "content" : "complete",
  "name" : "v3.ResponseMode",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "v3 Code System ResponseMode",
  "supliment" : null,
  "extension" : [ {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode" : "external"
  }, {
    "url" : "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger" : 0
  } ],
  "status" : "active",
  "hierarchyMeaning" : "is-a",
  "id" : "ce36653f-85c9-5b05-888e-cdbf031375fe",
  "valueSet" : "http://terminology.hl7.org/ValueSet/v3-ResponseMode",
  "url" : "http://terminology.hl7.org/CodeSystem/v3-ResponseMode",
  "identifier" : [ {
    "value" : "urn:oid:2.16.840.1.113883.5.1126",
    "system" : "urn:ietf:rfc:3986"
  } ],
  "concept" : [ {
    "code" : "D",
    "display" : "deferred",
    "definition" : "The receiver may respond in a non-immediate manner. Note: this will be the default value."
  }, {
    "code" : "I",
    "display" : "immediate",
    "definition" : "The receiver is required to assume that the sender is blocking and behave appropriately by sending an immediate response."
  }, {
    "code" : "Q",
    "display" : "queue",
    "definition" : "The receiver shall keep any application responses in a queue until such time as the queue is polled."
  } ],
  "caseSensitive" : true,
  "version" : "2018-08-12",
  "contact" : [ {
    "telecom" : [ {
      "value" : "http://hl7.org",
      "system" : "url"
    } ]
  } ]
}