http://terminology.hl7.org/CodeSystem/conformance-expectation|4.0.1

{
  "description" : "Indicates the degree of adherence to a specified behavior or capability expected for a system to be deemed conformant with a specification.",
  "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" : "ConformanceExpectation",
  "experimental" : false,
  "resourceType" : "CodeSystem",
  "title" : "ConformanceExpectation",
  "supliment" : null,
  "status" : "draft",
  "id" : "a4dfcc1f-3bf2-5b02-aa04-1d29406247da",
  "valueSet" : "http://hl7.org/fhir/ValueSet/conformance-expectation",
  "url" : "http://terminology.hl7.org/CodeSystem/conformance-expectation",
  "identifier" : [ {
    "value" : "urn:oid:2.16.840.1.113883.4.642.4.1271",
    "system" : "urn:ietf:rfc:3986"
  } ],
  "concept" : [ {
    "code" : "SHALL",
    "display" : "SHALL",
    "definition" : "Support for the specified capability is required to be considered conformant."
  }, {
    "code" : "SHOULD",
    "display" : "SHOULD",
    "definition" : "Support for the specified capability is strongly encouraged, and failure to support it should only occur after careful consideration."
  }, {
    "code" : "MAY",
    "display" : "MAY",
    "definition" : "Support for the specified capability is not necessary to be considered conformant, and the requirement should be considered strictly optional."
  }, {
    "code" : "SHOULD-NOT",
    "display" : "SHOULD-NOT",
    "definition" : "Support for the specified capability is strongly discouraged and should occur only after careful consideration."
  } ],
  "caseSensitive" : true,
  "version" : "4.0.1",
  "contact" : [ {
    "telecom" : [ {
      "value" : "http://hl7.org/fhir",
      "system" : "url"
    }, {
      "value" : "fhir@lists.hl7.org",
      "system" : "email"
    } ]
  } ]
}