[ https://issues.oasis-open.org/browse/ODATA-798?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=59756#comment-59756 ]
Ralf Handl commented on ODATA-798:
----------------------------------
See
- https://github.com/OData/vocabularies/blob/master/OData.Community.AlternateKeys.V1.md
- https://github.com/OData/vocabularies/blob/master/OData.Community.AlternateKeys.V1.xml
> 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
> Labels: Extension
> 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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