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
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