[OASIS Issue Tracker] (ODATA-953) Consider deprecating structural casting

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

     [ https://issues.oasis-open.org/browse/ODATA-953?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Pizzo updated ODATA-953:
--------------------------------

    Proposal: Remove current language around structural casting.  (was: Clarify that structural casting MUST NOT be applied anywhere other than the explicit cast operator; i.e., it MUST NOT be applied when using cast segments nor evaluating isof.)

> Consider deprecating structural casting
> ---------------------------------------
>
>                 Key: ODATA-953
>                 URL: https://issues.oasis-open.org/browse/ODATA-953
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Bug
>          Components: OData URL Conventions
>    Affects Versions: V4.0_ERRATA03
>         Environment: [Proposed]
>            Reporter: Michael Pizzo
>             Fix For: V4.01_WD01
>
>
> Section 5.1.1.8.1, cast, of [URL Conventions] currently says that the cast function can be used to cast to types outside of a type hierarchy using structural casting--whatever names (and types) match are cast to the new type:
> •	Services MAY support structural casting of entities and complex type instances to a derived type, or arbitrary structured type, by assigning values of identically named properties and casting them recursively. The cast fails if one of the property-value casts fails or the target type contains non-nullable properties that have not been assigned a value.
> Minimally, we need to clarify that this only applies to the cast function and not appending a cast segment, i.e., to a collection, since we count on appending cast segments to filter the collection according to those types that are of the particular type.
> We could go one step further and deprecate the structural casting from the cast function as something that seemed like a safe enough thing at the time but turned out not to be a great idea. 



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