URNs in SYSTEM declarations

Miles Sabin msabin at cromwellmedia.co.uk
Wed Oct 20 17:58:50 BST 1999

Simon St.Laurent wrote,
> URNs are an acceptable part of the URI spec, but XML 
> processors may have no way to resolve them to actual 
> resources.  What should a validating parser do when 
> confronted by:
> <!DOCTYPE myDoc SYSTEM "urn:itsSoObvious">

Exactly the same as what it would do if confronted by

 <!DOCTYPE myDoc SYSTEM "http://foo.bar.com/itsSoObvious">

if it had no way of resolving an http URI to an actual
resouce: report an error.

Given that not many XML processors have URN resolution 
support at the mo', I guess this means the combination of 
URNs for DTDs + validation isn't a very good idea (yet).



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

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