Contains a Data Resource Identifier formatted string
to identify a specific data resource instance.
The document root for all data resources is a
datastore resource container. Each top-level YANG
data nodes supported by the server will be represented
as a child node of the document root.
The canonical representation of a data resource identifier
includes the full server specification that is returned
in the Location header when a new data resource is created
with the POST method.
The abbreviated representation does not contain any server
location identification. Instead the identifier will start
with the '/' character to represent the datastore document
root for the data resource instance.
The server MUST accept either representation and SHOULD
return the canonical representation in any response message.