anchor.diff:  
   ### updateContext [POST /v2/updateContext]
   
  +The payload is an object which two properties:
  +
  +* `action`, to specify the kind of updateContext action to do (see OMA NGSI specification for the semantics), either UPDATE, APPEND or DELETE
  +* `entities`, an array of entities, each one specified using the the JSON entity representation format (described in a section above).
  +
  +Response:
  +
  +* Successful operation uses 201 Created.
  +* Errors use a non-200 and (optionally) an error payload. See subsection on Error Responses for more detail.
  +
  ++ Request (application/json)
  +
  +        {
  +            "action": "APPEND",
  +            "entities": [
  +                {
  +                    "type": "Room",
  +                    "id": "Bcn-Welt",
  +                    "temperature": 21.7,
  +                    "humidity": 60
  +                },
  +                {
  +                    "type": "Room",
  +                    "id": "Mad_Aud",
  +                    "temperature": 22.9,
  +                    "humidity": 85
  +                }
  +            ]
  +        }
  +
  ++ Response 201
  +
  +    + Headers
  +
  +            Location: /v2/entities/Bcn-Welt
  +
   ### subscribeContext [POST /v2/subscribeContext]
   
   ### updateContextSubscription [POST /v2/updateContextSubscription]
  
positive.code: Creates a new subscription.
  The subscription is represented by a JSON object as described at the beginning of this section.
  
  + Request (application/json)
  
          {
              "subject": {
                  "type": "Room",
                  "attributes": [
                        "humidity"
                  ],
                  "condition": "ONTIMEINTERVAL"
              },
              "notification": {
                  "callback": "http://localhost:1234",
                  "attributes": ["temperature", "humidity"],
                  "throttling": "PT5S"
              },
              "options": {
                  "duration": "PT1M"
              }
          }
  
  + Response 201
  
      + Headers
  
              Location: /v2/subscriptions/abcde98765
  
  ## Context Provider Registration [/v2/registrations]
  
  
negative.code:                         "temperature"
                      ]
                  },
                  "callback": "http://localhost:1234",               
                  "duration": "PT1M"
              }
          ]
  
  ### Create a new context provider registration [POST /v2/registrations]
  
  Creates a new registration. This is typically used for associating context providers
  to certain data.
  The registration is represented by a JSON object as described at the beginning of this section.
  
  Response:
  
  * Successful operation uses 201 Created
  * Errors use a non-200 and (optionally) an error payload. See subsection on Error Responses for more detail.
  
  + Request (application/json)
  
  