XSchema: Namespace PIs in XSchemas considered harmful

[james anderson]

John Cowan wrote:
> 
> The trouble comes when the same namespace is referred to in both
> places but with a different prefix.  For instance, suppose we
> have an XSchema defining SomeML.  The prefix used in SomeML documents
> is "SML:",

how does the prefix ("SML") bound in a 'SomeML' document affect a binding -
even one with the same prefix value - in an 'XSchema' document?

>            and a namespace PI (with or without an XSC:Namespace
> element) is used to define this.
> 
> However, the XSchema may also wish to have metadata elements drawn
> from other sources.  If the XSchema draws from SimpleML and uses
> the same prefix "SML:" for it, there is a conflict between using
> the "SML:" prefix and mentioning it.

why not just use "SoML" as the prefix for the SomeML region and "SiML" for the
SimpleML region?
aren't both the "use" and the "mention" in the same document?
if they are in the same document, why do the prefixes matter, so long as
they're different?
if they're not in the same document, how does one affect the other?

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