{
  "description": null,
  "_filename": "DataElement-NamingSystem.json",
  "package_name": "hl7.fhir.r2.elements",
  "date": null,
  "meta": {
    "lastUpdated": "2015-10-24T07:41:03.495+11:00"
  },
  "publisher": null,
  "element": [ {
    "max": "*",
    "min": 0,
    "path": "NamingSystem",
    "type": [ {
      "code": "DomainResource"
    } ],
    "short": "System of unique identification",
    "mapping": [ {
      "map": "N/A",
      "identity": "v2"
    }, {
      "map": "N/A",
      "identity": "rim"
    }, {
      "map": "conformance.terminology",
      "identity": "w5"
    } ],
    "constraint": [ {
      "key": "nsd-2",
      "human": "Can't have more than one preferred identifier for a type",
      "xpath": "not(exists(for $type in distinct-values(f:uniqueId/f:type/@value) return if (count(f:uniqueId[f:type/@value=$type and f:preferred/@value=true()])>1) then $type else ()))",
      "severity": "error"
    }, {
      "key": "nsd-3",
      "human": "Can only have replacedBy if naming system is retired",
      "xpath": "not(f:replacedBy) or f:status/@value='retired'",
      "severity": "error"
    }, {
      "key": "nsd-1",
      "human": "Root systems cannot have uuid or sid identifiers",
      "xpath": "not(f:kind/@value='root' and f:uniqueId/f:type/@value=('uuid', 'ruid'))",
      "severity": "error"
    } ],
    "definition": "A curated namespace that issues unique symbols within that namespace for the identification of concepts, people, devices, etc.  Represents a \"System\" used within the Identifier and Coding data types."
  } ],
  "name": null,
  "type": null,
  "experimental": "true",
  "resourceType": "DataElement",
  "title": null,
  "package_version": "1.0.2",
  "status": "draft",
  "id": "6a1a6210-5d70-44f2-857c-a81983cabaaf",
  "kind": null,
  "url": "http://hl7.org/fhir/DataElement/NamingSystem",
  "stringency": "fully-specified",
  "version": null
}