| name | data type | description | 
|---|---|---|
| datum | Datum | |
| coordinateSystem | CoordinateSystem | 
Example
{
  "datum" : {
    "anchorPoint" : { },
    "domainOfValidity" : {
      "verticalElements" : [ { }, { } ],
      "description" : { },
      "temporalElements" : [ { }, { } ],
      "geographicElements" : [ { }, { } ]
    },
    "scope" : { },
    "realizationEpoch" : 12345
  },
  "coordinateSystem" : {
    "dimension" : 12345,
    "remarks" : { },
    "name" : {
      "codeSpace" : "...",
      "version" : "...",
      "code" : "...",
      "authority" : { }
    },
    "identifiers" : [ {
      "codeSpace" : "...",
      "version" : "...",
      "code" : "...",
      "authority" : { }
    }, {
      "codeSpace" : "...",
      "version" : "...",
      "code" : "...",
      "authority" : { }
    } ],
    "alias" : [ {
      "parsedNames" : [ { }, { } ]
    }, {
      "parsedNames" : [ { }, { } ]
    } ]
  }
}