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Michael Pizzo commented on ODATA-1025:
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We actually have this situation already, as HTTP does not prohibit specifying the same query string option more than once; i.e., the client could say $top=5&$top=10.
We currently say, in [Section 5.1, System Query Options](*http://docs.oasis-open.org/odata/odata/v4.0/errata03/os/complete/part2-url-conventions/odata-v4.0-errata03-os-part2-url-conventions-complete.html#_Toc453752357), of URL Conventions "The same system query option MUST NOT be specified more than once for any resource."
I would suggest we simply make this rule irrespective of casing or whether it is prefixed with "$".
> Treatment of same query option in multiple "spellings"
> ------------------------------------------------------
>
> Key: ODATA-1025
> URL: https://issues.oasis-open.org/browse/ODATA-1025
> Project: OASIS Open Data Protocol (OData) TC
> Issue Type: Bug
> Components: OData URL Conventions
> Affects Versions: V4.01_CSD01
> Reporter: Ralf Handl
> Fix For: V4.01_CSD02
>
>
> V4.01 allows to omit the $ prefix for system query options and makes the query option name case-insensitive.
> How should servers react if a request contains e.g. $top=5&Top=10
> Should the request be rejected as the same (logical) query option appears twice, or should it succeed and $top is preferred over Top?
> What if it contains top=5&TOP=10?
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