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Subject: [OASIS Issue Tracker] (ODATA-881) Add support for Edm.Untyped

    [ https://issues.oasis-open.org/browse/ODATA-881?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=63363#comment-63363 ] 

Michael Pizzo commented on ODATA-881:

Added to [CSDL]. Do we need to define additional semantics anywhere?

> Add support for Edm.Untyped
> ---------------------------
>                 Key: ODATA-881
>                 URL: https://issues.oasis-open.org/browse/ODATA-881
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Bug
>          Components: OData CSDL, OData JSON CSDL
>    Affects Versions: V4.0_ERRATA02
>         Environment: [Proposed]
>            Reporter: Michael Pizzo
>              Labels: AdoptionBlocker, ready-for-vote
>             Fix For: V4.01_WD01
> We see a lot of scenarios where people are building REST services that return JSON payloads, but the JSON they need or want to generate is not supported by OData (for example, a mixed array or an array of arrays). This payload still has structure, it just can't necessarily be described by OData CSDL.
> For such payloads we could add an Edm.Untyped data type. Services could use Edm.Untyped to advertise that there was a property of a particular name present, but there is no type to describe the structure of the schema. It is essentially treated as an open property.
> The value of an Edm.Untyped property may be a primitive value, a structural value, or a collection. If a collection, it may contain any combination of primitive values, structural values, or collections (this is the only place a collection can contain a collection or a collection can contain a mix of primitive values, structural values, or collections).
> Edm.Untyped could also be used within a payload to specify that the current structured object has no declared type. It is either an anonymous structured (i.e., complex) type or an array.
> All structured dynamic properties, and all children of an Edm.Untyped property, are assumed to be untyped unless they are annotated with the "@odata.type" term, in which case they must conform to the type described by the annotation.

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