Leif Halvard Silli On 09-05-22 00.34:
The Dublin Core example in the "Extending Metadata in XHTML" section
of the "RDFa Tutorial" uses an old profile:
http://dublincore.org/documents/dcq-html/
It would probably be a good idea to replace it with the profile that
since 2008-08-04 has replaced it:
http://dublincore.org/documents/dc-html/
Additionally ... The purpose of the RDFa Tutorial is of course not not
teach DC-HTML. But as long as the example lacks the DC namespace
declaration,
<link rel="schema.DC" href="http://purl.org/dc/elements/1.1/"; >
then it becomes harder to understand the differences and likenesses
between RDFa-XHTML and DC-HTML:
* The prefix syntax differs, but it is a striking likeness that both of
them relies on namespaces and prefixes.
* As it stands, one might easily be lead to think that it is the use of
<head profile="http://dublincore.org/documents/dcq-html/";> in itself
that gives meaning to @name="DC.title". But all that the profile does
is that it permits "DC.word" to be interpreted as a DC property. But
without "schema.DC" there is actually no formal link between the
namespace and the prefix (as required, for RDF compliance [1]).
* DC-HTML can only affect the things that HTML allows @profile to affect
(@class, <meta>, @rel, m...@scheme, m...@content m...@name ).
Thus: The example code highlights the head element. But I'd suggest
adding l...@rel=schema.dc and highlighting that as well.
Another thing: the DC-HTML profile adds a vocabulary/vocabulary
convention. While RDFa adds some attributes which are reserved for a
vocabulary convention (prefixed vocabularies). But there is nothing in
that code example which tells that those attributes have been allowed in
this document. In order to make the examples correspond to each others,
I would have done that - or told that it isn't necessary (if it isn't
necessary).
[1] http://dublincore.org/documents/dc-html-notes/#sect-4
--
leif halvard silli
