anchor.diff:          [
             {
               "id": "abcdefg",
  -            "subject": {
  +            "dataProvided": {
                 "entities": [
                   {
                     "id": "Bcn_Welt",
  
positive.code:               }
              ],
              "attributes": [
                "humidity"
              ]
            },
            "callback":  "http://localhost:1234",
            "duration": "PT1M"
          }
  
  ### Update context provider registration [PATCH /v2/registrations/{registrationId}]
  
negative.code:                 "temperature"
                ]
              },
              "source": {
                "endPoint": "http://contextsource.example.org/v2/entities",
                "name": "Example 1",
                "description": "Example Context Source"
              },
              "expires": "2017-10-31T12:00:00"
            }
          ]
  
  ### Create a new context provider registration [POST /v2/registrations]
  
  Creates a new registration. This is typically used for associating context sources
  to certain data.
  The registration is represented by a JSON object as described at the beginning of this section.
  
  