[OASIS Issue Tracker] (ODATA-820) Allow indexing into collections

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

    [ https://issues.oasis-open.org/browse/ODATA-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=60678#comment-60678 ] 

Mark Stafford commented on ODATA-820:
-------------------------------------

In languages like Python and Perl, -1 means "the last item in the array", -2 means "the second-to-last item in the array", etc. It would be useful to introduce this semantic since we cannot order complex type collections in the context of a larger payload.

Note that this suggestion brings us out of alignment with JSON-Pointer, which does not support negative indexes.

> Allow indexing into collections
> -------------------------------
>
>                 Key: ODATA-820
>                 URL: https://issues.oasis-open.org/browse/ODATA-820
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: New Feature
>          Components: OData URL Conventions, Vocabularies
>    Affects Versions: V4.0_ERRATA02
>         Environment: [Proposed]
>            Reporter: Ralf Handl
>            Assignee: Ralf Handl
>              Labels: Extension, request_tc_discussion
>             Fix For: V4.01_WD01
>
>
> Allow indexing into collections.
> If servers can guarantee a stable order, they could advertise this via an annotation.
> This could be combined with ETags to identify the state the client is referring to.
> This might be combined with $orderby to let the client choose the order.



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