Add SelectRestrictions to Capabilities

[JefWight]

Similar to how the Capabilities vocabulary allows annotating entity sets with information about when an entity set supports $filter, $orderby, and $expand, it should be possible to express the ability to use $select, and which properties may be explicitly not selectable.

An example of why this is needed:
Some services may have the same entity exposed in different entity sets, with different sets of properties available from the different entity sets. This may happen more often with non-contained entities. For example, a service with both Products and Orders entity sets, where Product can have a collection of Orders it is part of, and Order can have a collection of Products it includes, it may be possible to select all Product properties from /Products, but a limited selection of propertiess from /Orders(id)/Products.

[ralfhandl]

Hi Jeff,

I'd like to continue this discussion on the odata-comment mailing list.

Thanks in advance!
--Ralf

[ralfhandl]

See https://lists.oasis-open.org/archives/odata-comment/201510/msg00003.html