anchor.diff:  + Request (application/json)
   
           {
  -"entities": [
  -    {
  +        "entities": [
  +        {
            "type": "Room",
            "isPattern": "true",
            "id": ".*"
  -    }
  -    ],
  -    "attributes": [
  -     "temperature"
  -    ],
  -    "reference": "http://localhost:8080/accumulate",
  -    "duration": "P1M"
  - }
  -
  -+ Response 201 (application/json)
  -
  -    + Headers
  -
  -            Location: /ngsi9
  -
  -    + Body
  -
  -            {
  -  "duration": "P1M",
  -    "subscriptionId": "52a745e011f5816465943d59"
  -  }
  +        }
  +        ],
  +        "attributes": [
  +        "temperature"
  +        ],
  +        "reference": "http://localhost:8080/accumulate",
  +        "duration": "P1M"
  +        }
  +
  ++ Response 201 (application/json)
  +
  +    + Headers
  +
  +            Location: /ngsi9
  +
  +    + Body
  +
  +            {
  +            "duration": "P1M",
  +            "subscriptionId": "52a745e011f5816465943d59"
  +            }
   
   ### Unsubscribe to Context availability operation [POST /unsubscribeContextAvailability]
   
  
positive.code: + Request (application/json)
  
          {
    "entities": [
        {
        "type": "Room",
        "isPattern": "false",
        "id": "Room1"
        }
    ],
    "attributes": [
        "temperature"
    ]
    }
  
  + Response 201 (application/json)
  
      + Headers
  
              Location: /ngsi9
  
      + Body
  
              {
    "contextRegistrationResponses": [
        {
        "contextRegistration": {
            "attributes": [
            {
                "isDomain": "false",
                "name": "temperature",
                "type": "float"
            }
            ],
            "entities": [
            {
                "id": "Room1",
                "isPattern": "false",
                "type": "Room"
            }
            ],
            "providingApplication": "http://mysensors.com/Rooms"
          }
        }
    ]
    }
  
  ### Subscribe to Context availability operation [POST /subscribeContextAvailability]
  
  
negative.code: |Resource|Base URI: http://{serverRoot}/ngsi9|HTTP verbs|
  |----|----|----|
  |   |  | POST|
  |Notify context resource|//{callbackURL}|Generic availability notification.The expected request body is an instance of notifyContextAvailabilityRequest; the response body is an instance of notifyContextAvailabilityResponse.|
  
  ## Terminology
  
  