Add missing Templates and replace None with Null

Change-Id: Ibf428bb9db53f9eafd5c7a0b0c9473cc29cf0d11
Add common fields section

Change-Id: I887849311723cd6e38082147bdda8f6cbf1cf904
Add valid_identifier template

Change-Id: I9b9520a904aaf0a613c232737294b5c0614f1d8d
Add attribute syntax definitions

Change-Id: I9bd57d4e6d39dc9a9df24d3bd6f2969efe25cb06
Add fricassée syntax elements

Change-Id: I868e73da9f83240b7cea59d232772428bf12e5b1
Add type syntax definitions

Change-Id: I24371788786195a830adf99525e31ad993ee21d0