anchor.diff:  
           {
           "subscriptionId": "52a745e011f5816465943d59"
  -  }
  -
  -+ Response 201 (application/json)
  -
  -    + Headers
  -
  -            Location: /ngsi9
  -
  -    + Body
  -
  -            {
  -"statusCode": {
  -  "code": "200",
  -  "reasonPhrase": "OK"
  -},
  -    "subscriptionId": "52a745e011f5816465943d59"
  -  }  
  +        }
  +
  ++ Response 201 (application/json)
  +
  +    + Headers
  +
  +            Location: /ngsi9
  +
  +    + Body
  +
  +            {
  +            "statusCode": {
  +            "code": "200",
  +            "reasonPhrase": "OK"
  +            },
  +            "subscriptionId": "52a745e011f5816465943d59"
  +            }  
     
  -  
  -  
  -
  -
  -
  +### Notify Context availability operation [POST /{callbackURL}]
  +
  +This operation is initiated by the You may create your own request using this action. It takes a JSON
  +object containing a unsubscribeContextAvailabilityRequest message.
  +
  ++ Request (application/json)
  +
  +        {
  +        "subscriptionId": "52a745e011f5816465943d59",
  +        "contextRegistrationResponses": [
  +        {
  +            "contextRegistration": {
  +                "entities": [
  +                    {
  +                        "type": "Room",
  +                        "isPattern": "false",
  +                        "id": "Room1"
  +                    },
  +                    {
  +                        "type": "Room",
  +                        "isPattern": "false",
  +                        "id": "Room2"
  +                    }
  +                ],
  +                "attributes": [
  +                    {
  +                        "name": "temperature",
  +                        "type": "float",
  +                        "isDomain": "false",
  +                        "metadatas": [
  +                            {
  +                                "name": "accuracy",
  +                                "type": "float",
  +                                "value": "0.8"
  +                            }
  +                        ]
  +                    }
  +                ],
  +                "providingApplication": "http://mysensors.com/Rooms"
  +            }
  +        }
  +        ]
  +        }
  +
  ++ Response 201 (application/json)
  +
  +    + Headers
  +
  +            Location: /ngsi9
  +
  +    + Body
  +
  +            {
  +            "statusCode": {
  +            "code": "200",
  +            "reasonPhrase": "OK"
  +            }
  +            }
  
positive.code: |Resource|Base URI: http://{serverRoot}/ngsi9|HTTP verbs|
  |----|----|----|
  |   |  | POST|
  |Notify context resource|//{notificationURI}|Generic availability notification.The expected request body is an instance of notifyContextAvailabilityRequest; the response body is an instance of notifyContextAvailabilityResponse.|
  
  ## Terminology
  
  
negative.code: + Request (application/json)
  
          {
          "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"
              }
  
  ### Unsubscribe to Context availability operation [POST /unsubscribeContextAvailability]
  
  