Editorial: Clarify document grammar rules #840
Merged
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Factored out of #777. Clarifies when type definition & extension can and cannot be included in executable documents
To do this more clearly, this introduces a number of new grammar rules. This does not change the actual behavior of a parser (all existing docs are parsed equivalently, no new docs are legal). However instead of using language that manipulates existing rules this can just reference those already restricted.
Hopefully this actually is useful for implementations which seek to offer clear subsets for each use case.