Shane McCarron wrote:
Inspired by a couple of Philips tests... [...] <div id="author" about="#author" xmlns:foaf="">
Empty values for namespace prefix declarations are a well-formedness error in all XML parsers that I'm aware of, so this document should cause a fatal error (and no triples) in any RDFa-in-XML parser.
(I can't actually see where http://www.w3.org/TR/REC-xml-names/ really says it's an error - the closest requirement is "If the attribute name matches PrefixedAttName [...] the namespace name may not be empty", which seems like misuse of RFC 2119 keywords but presumably is why everyone implements it as a well-formedness error.)
(In text/html there is no concept of well-formedness and no fatal parse errors, and no specification defines how xmlns attributes are meant to be processed in that environment; I don't have preferences for any particular behaviour, as long as it's clearly defined somewhere.)
-- Philip Taylor pj...@cam.ac.uk
