[Fiware-ngsi] AttributeDomainName problem

[Bisztray, Denes (NSN - HU/Budapest)]

Hi All,

Sorry for bringing up yet another topic, but I realised that the RESTful binding of the AttributeDomainName is a bit questionable.

The spec says (sec 5.5.1, pg 22):
AttributeDomainName (xsd:string) - Name of the attribute domain that logically groups together set of Context Information attributes. Examples of attribute domain are: device info (battery level, screen size, ...), location info (position, civil address, ...).

And below that at the ContextAttribute it says:
ContextAttribute [0..unbounded] - List of Context Information attributes. Note: In case of the attributeDomainName is specified all
contextAttribute have to belong to the same attributeDomainName.

So as it seems inside a ContextElement you have only one attributeDomain. 

However, the restful binding puts in inside:
/contextElements/{contextElementID}/{attributeDomainName}

And says: Retrieve the values of all attributes of the context element belonging to the specific domain

This seems to be a conflict to me. ( i.e. if that attributeDomainName is queried that is specified in the ContextElement then all attributes are returned otherwise none?).

What if we move this one direction higher? i.e.
/contextElements/{contextElementId}
/contextAttributeDomains/{attributeDomainName}

(not in the same level of {contextElementId} to avoid the resolution chaos)

Best,
Dénes
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