Race Category including Unknown

{
  "description" : "Based on CDC Race Category Value Set but included Unknown from the Null Flavor value set.",
  "compose" : {
    "exclude" : [ ],
    "include" : [ {
      "system" : "urn:oid:2.16.840.1.113883.6.238",
      "extension" : [ {
        "extension" : [ {
          "valueString" : "concept",
          "url" : "path"
        }, {
          "url" : "count",
          "valueInteger" : 6
        } ],
        "url" : "http://health-samurai.io/extensions/excised-data"
      } ],
      "version" : "1.2"
    }, {
      "system" : "http://terminology.hl7.org/CodeSystem/v3-NullFlavor",
      "extension" : [ {
        "extension" : [ {
          "valueString" : "concept",
          "url" : "path"
        }, {
          "url" : "count",
          "valueInteger" : 1
        } ],
        "url" : "http://health-samurai.io/extensions/excised-data"
      } ],
      "version" : "20090501"
    } ]
  },
  "date" : "2011-01-19T00:01:00+11:00",
  "meta" : {
    "source" : "https://phinvads.cdc.gov/vads/ViewValueSet.action?oid=2.16.840.1.114222.4.11.3405"
  },
  "name" : "PHVS_RaceCategory_CDC_Unk",
  "resourceType" : "ValueSet",
  "title" : "Race Category including Unknown",
  "extension" : [ {
    "url" : "http://health-samurai.io/extensions/source",
    "valueCode" : "db"
  } ],
  "status" : "active",
  "id" : "2.16.840.1.114222.4.11.3405",
  "url" : "http://phinvads.cdc.gov/fhir/ValueSet/2.16.840.1.114222.4.11.3405",
  "version" : "1"
}