Miscellanous feedback (public comment c201602e00003)

Public Review Comment https://lists.oasis-open.org/archives/odata-comment/201602/msg00003.html.

Summary

• 4.1.1 prose text describing structure of "keys" array doesn't match example 6
  (editor's note: example is correct, prose text is garbled)

• 4.1.2.5 Nullable Properties, Example 36: "format":"decimal" seems to be missing
  (editor's note: it is missing, should be there according to table in 4.1.2.1)

• a flag "nullable" would avoid the need to reverse-engineer this information from the type array tailored for validators
  (editor's note: this is currently discussed for Swagger, see https://github.com/OAI/OpenAPI-Specification/issues/229)

• 4.5.3.2 Path Expressions: The 2nd list does not contain @odata.navigationPropertyPath
  (editor's note: needs to be added)

• 4.5.3.6 Expression Apply: mismatch between prose text and example
  (editor's note: needs to be fixed)

• 4.5.3.10 Expression Not: can this contain annotations?
  (editor's note: yes)

• 4.5.3.11 Expression Null: Why do annotations not live next to @odata.null, like it is the case for @odata.if etc.? Comment gives two proposals for a simpler syntax
  (editor's note: if edm:Null is an item in a collection it needs to be represented as either just null or as an object. Could make that dependent on the existence of annotations within edm:Null or accept feature loss in JSON representation)

• 4.5.3.12 Expression UrlRef: The text does not fit to the example, but I think the example is better and should win
  (editor's note: agreed