anchor.diff:  
   ### Discover Context [GET]
   
  -TODO
  +Retrieve all availability information about the context entity represented by the resource (i.e. URIs of all applications that provide context information about the entity).
  +The response body is an instance of DiscoverContextAvailabilityResponse. Its ContextRegistrationResponseList contains context availability information related to the context entity that is determined by the {entitityID} part of the resource URI.
  +
  +Use a GET request to retreive results for the {EntityID} specified in the URL path.
   
   + Response 200 (application/json)
   
  
positive.code:             ]
              }
  
  ## Convenience operation - Attribute container of Context Entity Type    [/contextEntityTypes/{typeName}/attributes]
  
  ### Discover Context [GET]
  
  TODO
  
  + Response 200 (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"
              }
              }
              ]
              }
              
  ## Convenience operation - Attribute of Context Entity Type    [/contextEntityTypes/{typeName}/attributes/{attributeName}]
  
  ### Discover Context [GET]
  
  TODO
  
  + Response 200 (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"
              }
              }
              ]
              }
  
  ## Convenience operation - Availability Subscription [/contextAvailabilitySubscriptions]
  
  ### Create a new availability subscription [POST]
  
  You may create your own request using this action. It takes a JSON
  object containing a subscribeContextAvailability message.
  
  + Request (application/json)
  
  
negative.code: 
  ### Cancel Subscription [DELETE]
  
  This operation is used for deleting a context availability subscription, which corresponds to an unsubscribeContextAvailability operation. The request contains no body, and the response body is of type UnsubscribeContextAvailabilityResponse.
  
  You may create your own request using this action. It takes a JSON object containing a updateContextAvailabilitySubscriptionRequest message.
  
  + Request (application/json)
  
  