anchor.diff:   + Response 200 (application/json)
          
           {
  -			"subscribeResponse": {
  -				"subscriptionId": "12345",
  -				"duration": "P5Y",
  -				"throttling": "P5Y"
  -			}
  -		}
  +            "subscribeResponse": {
  +                "subscriptionId": "12345",
  +                "duration": "P5Y",
  +                "throttling": "P5Y"
  +            }
  +        }
   
   ## Standard Context Subscription Update [/ngsi10/updateContextSubscription]
   
  
positive.code: + Response 200 (application/json)
  
          {
  			"errorCode": {
  				"details": "No Attribute with given value IDs found",
  				"reasonPhrase": "Context Element not Found",
  				"code": 404
  			}
  		}     
  
  ### Append context attribute values [POST]
  
  
negative.code: + Response 200 (application/json)
        
          {
              "subscriptionId": "12345",
              "statusCode": {
                  "reasonPhrase": "OK",
                  "code": 200
              }
          }
          
  + Response 200 (application/xml)
  
          <?xml version="1.0" encoding="UTF-8"?>
  