Re: [xml-dev] If I want to use catalogs for XSDs, must document instance

[Jirka Kosek <jirka@kosek.cz>]

On 20.4.2012 8:00, Liam R E Quin wrote:

> The answer is that you have to tell your schema processor how to find he
> schemas, and that schemaLocation attributes are one way, but not the
> only way - the program might have another way to do it - but doing it
> based on namespace URIs would not be a good way.

Might be I'm not understanding you correctly Liam, but IMHO namespace
URI is perfect way to *indirectly* say where the schema is located.

Good XML application support mapping file where namespace URI can be
mapped to schema which should be used for validation. Graham should
inspect his tool whether it provides such facility. In oXygen there is
Document Type Association option for this, Emacs+nxml support
locatingRules, NVDL can be used for this as well.

In theory on namespace URI could reside RDDL document which can point to
XML schema, but past experience with heavy loaded network resources
(XHTML DTDs) shows that's not wise to depend on such approach in an
application.

				Jirka

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