anchor.diff:  + Request (application/json)
   
           {
  -  "entities": [
  -      {
  -      "type": "Room",
  -      "isPattern": "false",
  -      "id": "Room1"
  -      }
  -  ],
  -  "attributes": [
  -      "temperature"
  -  ]
  -  }
  -
  -+ Response 201 (application/json)
  -
  -    + Headers
  -
  -            Location: /ngsi9
  -
  -    + Body
  -
  -            {
  -  "contextRegistrationResponses": [
  -      {
  -      "contextRegistration": {
  -          "attributes": [
  -          {
  +        "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": [
  -          {
  +            }
  +            ],
  +            "entities": [
  +            {
                 "id": "Room1",
                 "isPattern": "false",
                 "type": "Room"
  -          }
  -          ],
  -          "providingApplication": "http://mysensors.com/Rooms"
  -        }
  -      }
  -  ]
  -  }
  +            }
  +            ],
  +            "providingApplication": "http://mysensors.com/Rooms"
  +            }
  +            }
  +            ]
  +            }
   
   ### Subscribe to Context availability operation [POST /subscribeContextAvailability]
   
  
positive.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"
    }
    
  ### Update Subscription to Context availability operation [POST /updateContextAvailabilitySubscription]
  
  
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
  
  