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   Re: [xml-dev] grammar cache and xs:redefine

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Tom Moog tapped out:
> Suppose you have a schema A and schemas B1 and B2 which
> redefine element E from schema A (differently).  They all have the
> same namespace (call it alpha). Suppose your application maintains
> a grammar cache with these schemas
> Since the namespace no longer uniquely identifies the schema, how
> does one decide which schema to use from the grammar cache
> when a  document contains schemaLocation="alpha some-url" - or
> does one use the url to disambiguate ?  Since B1 and B2 are different,
> it is not clear which one should supercede A.

You have to use the URL.  You can cache A, B1, and B2, but you need to
know which schema is actually at some-url in order to know which one to
apply to the document.

UNLESS, of course, the schema represents some kind of contract or
agreement, in which case it doesn’t matter what’s at some-url, it only
matters that the document meets the specified terms.  But in that case,
having three variants is going to give you problems anyhow.

Christopher R. Maden, Principal Consultant, crism consulting
<URL: http://crism.maden.org/consulting/ >
PGP Fingerprint: BBA6 4085 DED0 E176 D6D4  5DFC AC52 F825 AFEC 58DA


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