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   PLEASE do not cross-post xml-dev to XQuery comments list

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PLEASE do not cross-post xml-dev to XQuery comments list. The latter 
operates at a much lower traffic level and a much higher signal-to-noise 
ratio than is customeray for xml-dev.

This comment is certainly appropriate - but not as a cross-post!

--- Begin Message ---
Michael Kay wrote:

> The XQuery specification, incidentally, defines a mapping of error QNames to
> error URIs. It's different from this one, of course.

The error URIs in the XQuery spec look like this:


Something similar has been tried before in XML digital signatures and 
RDF. For reasons elucidated in the draft proposal, this format is not 
suitable for all QNames and does not work as a generic mechanism for 
encoding Qnames as URIs.

The XQuery format also seem to suffer from the disease that everything 
must be an http URI even when, as in this case, the URI is not actually 
resolvable. (http://www.w3.org/2004/10/xqt-errors is a real page but the 
fragment ID doesn't point to anything.)

I agree with most of your concerns about the details of the proposed 
qname URN scheme (IRIs vs. URIs, percent encoding, etc.) but at a 
fundamental level I think the proposed scheme is better than what XQuery 
is proposing. I would suggest that XQuery adopt the new qname URN scheme 
rather than using http URIs to identify error codes. In fact, I'll cc 
this to the XQuery working group to register it as a formal comment.

Elliotte Rusty Harold  elharo@metalab.unc.edu
XML in a Nutshell 3rd Edition Just Published!

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