anchor.diff:  + Response 200 (application/json)
   
           {
  -			"errorCode": {
  -				"details": "No Attribute with given value IDs found",
  -				"reasonPhrase": "Context Element not Found",
  -				"code": 404
  -			}
  -		}     
  +            "errorCode": {
  +                "details": "No Attribute with given value IDs found",
  +                "reasonPhrase": "Context Element not Found",
  +                "code": 404
  +            }
  +        }     
   
   ### Append context attribute values [POST]
   
  
positive.code: + Request (application/json)
         
          {
  			"subscriptionId": "1245"
  		}
          
  + Response 200 (application/xml)
  
  
negative.code: 
  + Response 200 (application/json)
  
          {
              "contextResponses": [{
                  "contextElement": {
                      "attributes": [{
                          "contextValue": "6",
                          "metadata": [{
                              "name": "ID",
                              "value": "1110",
                              "type": "string"
                          }],
                          "name": "indoorTemperature",
                          "type": "degree"
                      }],
                      "domainMetadata": [],
                      "entityId": {
                          "isPattern": false,
                          "id": "ConferenceRoom",
                          "type": "Room"
                      }
                  },
                  "statusCode": {
                      "reasonPhrase": "Ok",
                      "code": 200
                  }
              }, {
                  "contextElement": {
                      "attributes": [{
                          "contextValue": "13",
                          "name": "indoorTemperature",
                          "type": "degree"
                      }],
                      "domainMetadata": [],
                      "entityId": {
                          "isPattern": false,
                          "id": "Office",
                          "type": "Room"
                      }
                  },
                  "statusCode": {
                      "reasonPhrase": "Ok",
                      "code": 200
                  }
              }]
          }
  
  ## Convenience Interaction with Attribute Domain of Entity Type [/ngsi10/contextEntityTypes/Room/attributeDomains/roomInfo]
  
  