[OASIS Issue Tracker] (ODATA-798) Semantic Key or Alternate Key for entity types

Ralf Handl created ODATA-798:
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             Summary: Semantic Key or Alternate Key for entity types
                 Key: ODATA-798
                 URL: https://issues.oasis-open.org/browse/ODATA-798
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: OData CSDL, OData URL Conventions
    Affects Versions: V4.0_ERRATA02
            Reporter: Ralf Handl
             Fix For: V4.1_WD01


Sometimes an entity type has a technical unique key, e.g. a sequence number or a guid, as well as one or more "semantic" or "alternate" keys, e.g. a User could be identified via a UserID or alternatively via an EmailAddress, or a Person could be identified via a Country+PassportNumber combination or a Country+SSN combination.

These "semantic" or "alternate" keys may include nullable properties (you may not know a person's SSN, but if you know it, it identifies the person), and there could be more than one of them, each consisting of a different set of properties.



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