Re: RDFa Tutorial

Hi, thanks for preparing good starter document. I noticed some people
in twitter already talking about this tutorial as "the first read",
after the Google announcement.

A few minor comments on vocabulary examples:

- foaf:img has foaf:Person as its domain and foaf:Image as its range.
Hence the relation in "Swapping subject and object" section should be
inverse, or better to use foaf:depicts for the example instead.

- dtend property of iCalendar is defined to specify "non-inclusive end
of the event", so the value of content attribute should be 2009-04-25
rather than 2009-04-24.

- the namespace URI of RDFical ".../cal#" is proposed to be deprecated
in favor of ".../cal/icaltzd#" (though not determined) [1].


These are not directly related to RDFa syntax introduction, but I
expect this document to be a starting point for many people to learn
these vocabularies. The correct usage examples would be very
beneficial for readers.

best regards,

[1]http://lists.w3.org/Archives/Public/www-rdf-calendar/2008Dec/0000.html
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