Questions on selecting a grammar after a SE(*)

Dear EXI WG,

I would like to have some clarification on two cases regarding SE(* ) grammar selection.

0) A schema with several element definitions for the same QName.
We can have a schema with several local element definitions and at most one global element definition with the same QName.
I assume that we generate as many grammars as needed for the same QName element and that the selection of the right grammar in schema-informed mode  is done using scope information. Is that assumption right or is a different approach being used?

1)  Wildcard SE(*).
Which grammar should I peak for a SE(*) belonging to a wildcard term?

-          If I have a global element definition and one or more local element definition, should I peak the global element grammar?

-          If I have only one local element definition, should I peak the local element grammar or peak/create a built-in grammar?
I did not found  much description on the wildcard section related to that. Some guidance may be good there.

2) Built in SE(*).
Which grammar should I peak for a SE(*) belonging to a built-in grammar?
If I have a global element definition (plus maybe local element definitions), should I peak/create a built-in grammar or the global element grammar ?
If I have a local element definition, should I peak a built-in grammar or the local element grammar ?
My understanding of the current spec (see the semantics section of 8.4.3) is that a SE(*) belonging to a built-in grammar may only lead to a built-in grammar for its content but my understanding may be too restrictive?
Since we can go from built-in grammar to schema-informed grammar using xsi:type, I would hope that at least when we have a GED grammar, we are able to go from built-in to schema-informed grammar directly through the SE mechanism.

Regards,
                Youenn