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   RE: Locating schemas (was Re: Irony heaped on irony)

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  • From: Leigh Dodds <ldodds@ingenta.com>
  • To: John Aldridge <john.aldridge@informatix.co.uk>, xml-dev@XML.ORG
  • Date: Mon, 22 May 2000 16:35:33 +0100

> -----Original Message-----
> From: owner-xml-dev@xml.org [mailto:owner-xml-dev@xml.org]On Behalf Of
> John Aldridge
> Sent: 22 May 2000 12:04
> To: xml-dev@xml.org
> Subject: Locating schemas (was Re: Irony heaped on irony)


> Unfortunately, this author may have no understanding of the
> environment of the _reader_ of the XML document. The schema location used
> the XML author may be inaccessible to the reader, and this reader should
not have
> to resort to editing the XML document before (s)he can make sense of it.
> I don't object to URI dereferencing as a fallback if the reader has not
> given more explicit instructions, but the primary method should
> be for the reader to "install" a schema locally, and for XML processing
> software then to "know" where to find the schema information for the
> corresponding namespace.

I agree. In fact this is a general issue with any resource identification
mechanism. We've recently seen this solved for PUBLIC identifiers using
catalogs. Retrieving an XML Schema, or whatever else is at the end of
a Namespace URI (Schema, documentation, or the mythical XML Package)
hits exactly the same problem.

Being able to "install" a schema locally would be extremely useful.

We just need to define how we want the software to "know" where
to find the schema. The obvious solution to me is a catalog/packaging
based system.


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