- From: Mark Birbeck <mark.birbeck@webbackplane.com>
- Date: Thu, 19 Jun 2008 22:05:16 +0100
- To: RDFa <public-rdf-in-xhtml-tf@w3.org>
- Cc: "SWD Working SWD" <public-swd-wg@w3.org>
Hello, > section 7 says the RDFa default prefix mapping is > http://www.w3.org/1999/xhtml/vocab# and has to be used when the prefix but > not the colon is omitted in a CURIE. At the bottom of page 53 is then said > that "the mapping to use with the default prefix is the current default > mapping" which would be the value of @xmlns in scope and therefore normally > http://www.w3.org/1999/xhtml (section 4.1). The top of that section says: "...in RDFa the 'default prefix' mapping is http://www.w3.org/1999/xhtml/vocab#." So perhaps we could make this clearer at the bottom of the section by saying: "the mapping to use with the default prefix is the current default prefix mapping" I.e., adding the word "prefix". > According to that, in Test 63 the predicate would be > http://www.w3.org/1999/xhtmlnext rather than > http://www.w3.org/1999/xhtml/vocab#next (rel=":next"). Additionally, page 29 > states that the prefix http://www.w3.org/1999/xhtml/vocab# should be used > only for values in @rel/@rev without prefix and colon. Please correct me if > I misunderstood this part. > """ I'm having trouble working out what part of the spec this is referring to, because of the page number thing. But the intention is that the @rel/@rev values are 'tokens' that map to a URI. In other words, they are not 'unprefixed' values that then acquire a prefix. It just so happens that all of the 'fixed' values map to URIs in the XHTML vocab space, but one of the tokens could just as easily map to a URI in some other space. The confusion probably arises because the CURIE syntax *in general* does allow for unprefixed values, and explains how they should be processed. But it also allows for a list of reserved values to be defined, and that is the feature that we are using for @rel/@rev values, and therefore why we say "the mapping to use when there is no prefix is not defined". Mark -- Mark Birbeck, webBackplane mark.birbeck@webBackplane.com http://webBackplane.com/mark-birbeck webBackplane is a trading name of Backplane Ltd. (company number 05972288, registered office: 2nd Floor, 69/85 Tabernacle Street, London, EC2A 4RR)
Received on Thursday, 19 June 2008 21:18:25 UTC