Allow complex properties or components of complex properties as key parts

The value of the Name attribute of the PropertyRef element MUST be a propertyPath = *(SimpleIdentifier "/") SimpleIdentifier resolving to complex or primitive property of the entity type itself or a property *(of a complex property) of a complex property of the entity type. All properties in the path MUST NOT be nullable. Accepted: https://www.oasis-open.org/committees/download.php/47919/odata-meeting-21_on-20130117-minutes.html#odata-60

https://www.oasis-open.org/committees/download.php/48023/odata-core-v1.0-wd01-part3-csdl-2013-01-25-RH.doc https://tools.oasis-open.org/version-control/browse/wsvn/odata/trunk/spec/schemas/csdl.xsd?op=diff&rev=157&sc=0 Accepted: https://www.oasis-open.org/committees/download.php/48174/odata-meeting-24_on-20130207-minutes.html#odata-60