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   RE: URNs in SYSTEM declarations

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  • From: Miles Sabin <msabin@cromwellmedia.co.uk>
  • To: XML-Dev Mailing list <xml-dev@ic.ac.uk>
  • Date: Wed, 20 Oct 1999 17:54:36 +0100

Simon St.Laurent wrote,
> Next question... do any XML parsers support URNs?  Do
> they use these resolution protocols?

If you're working in java you could put together a URN
protocol handler, in which case a java.net.URLConnection
would be able to do the resolution. Most java parsers
will, by default, use a URLConnection to fetch the
external subset, so that should do the trick.

Alternatively, if you're using SAX, or a SAX-like API 
you could put together a custom EntityResolver.

> Does a lack of support for URNs in any way affect XML 
> conformance?

Well, if the parser claims to be validating, *and*
doesn't have URN resolution support, then it wouldn't
be conformant if it didn't report a fatal error. By the 
sound of it, the parser you're using was doing the Right 



Miles Sabin                          Cromwell Media
Internet Systems Architect           5/6 Glenthorne Mews
+44 (0)181 410 2230                  London, W6 0LJ
msabin@cromwellmedia.co.uk           England

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