anchor.diff:  
           {
             "value": 21.7,
  -          "type": "none",
  +          "type": "Number",
             "metadata": {}
           }
   
  
positive.code:   
  ## Status
  
  This is a work in progress and is changing on a daily basis.
  Please send your comments to fiware-ngsi@lists.fiware.org.
  You can trace the discussions checking the archives of the mailing list:
  https://lists.fiware.org/private/fiware-ngsi/ (list subscription required).
  
  In addition, note that a list of currently open discussions is available at
  
  * https://github.com/telefonicaid/fiware-orion/issues/1022
  * https://github.com/telefonicaid/fiware-orion/issues/1034
  * https://github.com/telefonicaid/fiware-orion/issues/1035
  
  ## Copyright
  
  
negative.code:   update operations
  * a **context availability interface** for exchanging information on how to obtain context
    information (whether to separate the two interfaces is currently under discussion).
  
  ## Terminology
  
  