[OASIS Issue Tracker] (ODATA-1575) Remove restriction on Partner navigation

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

Ralf Handl created ODATA-1575:
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             Summary: Remove restriction on Partner navigation
                 Key: ODATA-1575
                 URL: https://issues.oasis-open.org/browse/ODATA-1575
             Project: OASIS Open Data Protocol (OData) TC
          Issue Type: Improvement
          Components: CSDL JSON , CSDL XML
    Affects Versions: V4.01_OS
            Reporter: Ralf Handl
             Fix For: V4.02_WD01


CSDL section [8.3 Partner Navigation Property|https://docs.oasis-open.org/odata/odata-csdl-xml/v4.01/odata-csdl-xml-v4.01.html#sec_PartnerNavigationProperty] requires that

{quote}
If a partner navigation property is specified, this partner navigation property MUST either specify the current navigation property as its partner to define a bi-directional relationship or it MUST NOT specify a partner navigation property. The latter can occur if the partner navigation property is defined on a complex type, or if the current navigation property is defined on a type derived from the type of the partner navigation property.
{quote}

This restriction is harmful in the following situation
 * Foo
 ** allBar Type=Collection(Bar) Partner=foo
 ** redBar Type=Collection(Bar) Partner=foo
 ** greenBar Type=Collection(Bar) Partner=foo
 * Bar
 ** foo Type=Foo Partner=allBar

These partner navigation properties satisfy the basic rules

{quote}
If the partner navigation property is single-valued, it MUST lead back to the source entity from all related entities. If the partner navigation property is collection-valued, the source entity MUST be part of that collection.
{quote}

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