[OASIS Issue Tracker] Updated: (ODATA-365) Rename edm:AssertType to edm:CastToType and clearify behaviour

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

     [ http://tools.oasis-open.org/issues/browse/ODATA-365?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ralf Handl updated ODATA-365:
-----------------------------

        Fix Version/s: V4.0_CSD02
    Affects Version/s: V4.0_CSD01

> Rename edm:AssertType to edm:CastToType and clearify behaviour
> --------------------------------------------------------------
>
>                 Key: ODATA-365
>                 URL: http://tools.oasis-open.org/issues/browse/ODATA-365
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Improvement
>          Components: OData Protocol 
>    Affects Versions: V4.0_CSD01
>         Environment: [Proposed]
>            Reporter: Martin Zurmuehl
>             Fix For: V4.0_CSD02
>
>
> In most programming languages, an assertion is a predicate (a true-false statement) placed in a program to indicate that the developer *thinks* that the predicate is always true at that place. If the assertion is false, an assertion failure results, which typically causes execution to abort.
> In contrast the dynamic expression edm:AssertType behaves different: It casts the value of the child expression to the specified type. So the name edm:CastToType would express this behaviour better. We must define the behaviour if the cast fails: I propose to return the NULL value as result of dynamic expression.
> The third proposal is to provide a more informative example in the specification, e.g.
> <Annotation Term="org.example.display.Threshold">
>  <AssertType Type="Edm.Decimal">
>   <Path>Midpoint</Path>
>  </AssertType>
> </Annotation>
> assume Midpoint is of type edm:String an the Term is of type edm:PrimitiveType

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