[OASIS Issue Tracker] (ODATA-847) Clarification: use of Schema namespace aliases within URLs

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

Evan Ireland created ODATA-847:
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             Summary: Clarification: use of Schema namespace aliases within URLs
                 Key: ODATA-847
                 URL: https://issues.oasis-open.org/browse/ODATA-847
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData CSDL, OData URL Conventions
    Affects Versions: V4.0_ERRATA03
            Reporter: Evan Ireland
            Priority: Minor


CSDL spec section 3.4.2 states:

"An alias is only valid within the document in which it is declared; a referencing document has to define its own aliases with the edmx:Include element."

Protocol spec section "11.2.4.1 System Query Option $select" states:

"The value of the $select query option is a comma-separated list of properties, qualified action names, qualified function names, the star operator (*), or the star operator prefixed with the namespace or alias of the schema in order to specify all operations defined in the schema."

So now we see that aliases can be valid/referenced outside their defining document.

If a URL uses an alias, is it limited to using an alias defined in the outermost CSDL document, i.e. it a URL prohibited from using aliases defined within referenced CSDL documents? If it is not so limited, then how do we resolve ambiguity of potentially multiple-defined aliases (defined with two different meanings in referncing and referenced CSDL documents)?





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