Language codes with language and optionally a region modifier

{
  "description" : "This value set includes codes from [BCP-47](http://tools.ietf.org/html/bcp47). This value set matches the ONC 2015 Edition LanguageCommunication data element value set within C-CDA to use a 2 character language code if one exists,   and a 3 character code if a 2 character code does not exist. It points back to [RFC 5646](https://tools.ietf.org/html/rfc5646), however only the language codes are required, all other elements are optional.",
  "compose" : {
    "exclude" : [ ],
    "include" : [ {
      "system" : "urn:ietf:bcp:47",
      "filter" : [ {
        "property" : "ext-lang",
        "value" : "false",
        "op" : "exists"
      }, {
        "property" : "script",
        "value" : "false",
        "op" : "exists"
      }, {
        "property" : "variant",
        "value" : "false",
        "op" : "exists"
      }, {
        "property" : "extension",
        "value" : "false",
        "op" : "exists"
      }, {
        "property" : "private-use",
        "value" : "false",
        "op" : "exists"
      } ]
    } ]
  },
  "date" : "2019-05-21",
  "publisher" : "HL7 US Realm Steering Committee",
  "jurisdiction" : [ {
    "coding" : [ {
      "system" : "urn:iso:std:iso:3166",
      "code" : "US",
      "display" : "United States of America"
    } ]
  } ],
  "name" : "LanguageCodesWithLanguageAndOptionallyARegionModifier",
  "resourceType" : "ValueSet",
  "title" : "Language codes with language and optionally a region modifier",
  "extension" : [ {
    "url" : "http://health-samurai.io/extensions/source",
    "valueCode" : "db"
  } ],
  "status" : "active",
  "id" : "c457415a-c53a-478b-bddd-035f99da8240",
  "url" : "http://hl7.org/fhir/us/core/ValueSet/simple-language",
  "version" : "3.1.1",
  "contact" : [ {
    "telecom" : [ {
      "system" : "url",
      "value" : "http://hl7.org/fhir"
    } ]
  } ],
  "text" : {
    "div" : "<div xmlns=\"http://www.w3.org/1999/xhtml\"><ul><li>Include codes from <a href=\"https://terminology.hl7.org/1.0.0//CodeSystem-v3-ietf3066.html\"><code>urn:ietf:bcp:47</code></a> where ext-lang doesn't exist, script doesn't exist, variant doesn't exist, extension doesn't exist and private-use doesn't exist</li></ul></div>",
    "status" : "generated"
  }
}