[OASIS Issue Tracker] (ODATA-1499) Clarify how to allow/dissalow unbound functions in $filter/$orderby

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

Christof Sprenger created ODATA-1499:
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             Summary: Clarify how to allow/dissalow unbound functions in $filter/$orderby
                 Key: ODATA-1499
                 URL: https://issues.oasis-open.org/browse/ODATA-1499
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: Protocol
    Affects Versions: V4.01_ERRATA01
            Reporter: Christof Sprenger


[11.5.4.1 Invoking a Function|https://docs.oasis-open.org/odata/odata/v4.01/os/part1-protocol/odata-v4.01-os-part1-protocol.html#sec_InvokingaFunction]
 states (emphasize mine)
{quote}Functions can be used within $filter or $orderby system query options. Such functions can be bound to a resource, as described above, *or called directly* by specifying the namespace- (or alias-) qualified function name.
{quote}
It states how bound functions can be used. 
 The standard also explains how function imports can be used but there seems to be now explanation if and how they are connected for the "called directly" case.

What is necessary to use a function in $filter an $apply? (e.g. is a function import necessary?)
 And depending on the answer, how can it's usage in these cases be restricted/disabled ?



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