anchor.diff:  
   # Group Root
   
  -## NGSI-9 API [/]
  -
  -### Register Context operation [POST /registerContext]
  +### Context Registration Resource [POST /registerContext]
   
   You may create your own request using this action. It takes a JSON
   object containing a RegisterContextRequest message.
  
positive.code:             "code": "200",
              "reasonPhrase": "OK"
              }
              }
negative.code: |Individual context entity |/contextEntities/{EntityID}|Retrieve information on providers of any information about the context entity|-|Register a provider of information about the entity|-|
  |Attribute container of individual context entity|/contextEntities/{EntityID}/attributes|Retrieve information on providers of any information about the context entity|-|Register a provider of information about the entity|-|
  |Attribute of individual context entity|/contextEntities/{EntityID}/attributes/{attributeName}|Retrieve information on providers of the attribute value|-|Register a provider of information about the attribute|-|
  |Context entity type|/contextEntityTypes/{typeName}|Retrieve information on providers of any information about context entities of the type|-|Register a provider of information about context entitie of the type|-|
  |Attribute container of entity type|/contextEntityTypes/{typeName}/attributes|Retrieve information on providers of any information about context entities of the type|-|Register a provider of information about context entitie of the type|-|
  |Attribute of entity type|/contextEntityTypes/{typeName}/attributes/{attributeName}|Retrieve information on providers of values of this attribute of context entities of the type|-|Register a provider of information about this attribute of context entities of the type|-|
  |Availability subscription container|/contextAvailabilitySubscriptions|-|-|Create a new availability subscription|-|
  |Availability subscription|/contextAvailabilitySubscriptions/{subscriptionID}|-|Update subscription|-|Cancel subscription
  
  