Henry,

Thanks for your comment. The working group will no doubt review your comment and have a formal response. Just to clarify something though, the XML concept of "default namespace" does not necessarily apply to CURIEs. CURIEs *do* permit the use of a "default prefix" and its mapping (an item that is preceded by ONLY a colon), and do ALSO permit a collection of host language-defined "reserved values" (an item that is preceded by NOTHING). There are a variety of arcane reasons for this, but I understand your confusion. These various states are described in [1]. And while it is possible that we do not have to permit this variation, doing so will make it more difficult for us to help people who are seemingly allergic to colons from adopting modules that rely upon CURIEs - RDFa, Role, Access, etc.

I will look closely at [1] to see if there is a way to ensure the above is clearer. If you have any suggestions, please send them along.

[1] http://www.w3.org/MarkUp/2008/ED-curie-20081008/#s_syntax

Henry S. Thompson wrote:
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I've looked through the new draft [1], and without prejudice to any
official TAG response, I have one remaining personal issue.

I see that you have clarified the syntax so that it is clear that
e.g. :foo is a valid CURIE.  But the discussion of what IRI a CURIE
represents doesn't respect the distinction you are depending on wrt
'foo' vs. ':foo', namely "default prefix" versus "default namespace"
(which is pretty obscure, it has to be said -- do you really _have_ to
do this?  It blows the syntactic parallel between element
names/attribute names/QNames and CURIES. . .).

In particular, no mention of default namespace is made in the crucial
paragraph (the one which begins "CURIEs are an abbreviation for
strings").  I suggest you separate out and promote the definition of
the mapping, for instance give a three-bullet quasi-formal
specification of the CURIE->IRI mapping, possibly twice (once for XML
languages and once for non-XML languages), _before_ this paragraph,
possibly in its own sub-section.

ht

[1] http://www.w3.org/MarkUp/2008/ED-curie-20081008/
- -- Henry S. Thompson, School of Informatics, University of Edinburgh
                         Half-time member of W3C Team
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
                Fax: (44) 131 651-1426, e-mail: [EMAIL PROTECTED]
                       URL: http://www.ltg.ed.ac.uk/~ht/
[mail really from me _always_ has this .sig -- mail without it is forged spam]
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