[dsdl-comment] Schema rewriting for attribute sections (NVDL)

8.7.3 of 19757-4 mandates schema rewriting for RELAX NG.

        For each (v, e) in PlanAtt, the NVDL dispatcher writes the
        schema g in v. If g is written in RELAX NG, g is rewritten as
        <element><anyName/>g</element>. If g is written in some other
        schema language and that schema language provides a schema
        rewriting mechanism for NVDL, g is rewritten by applying that
        mechanism. Otherwise, g is not rewritten.

I heard that oNVDL supports this rewriting, but no other NVDL
implementations suppor it. One implementor argues that this rewriting
is hard unless you are willing to manipulate internal representations
of RELAX NG schemas.

Is this so hard? If if is the case, should we try to delete it?

Cheers,

-- 
MURATA Makoto <murata@hokkaido.email.ne.jp>
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