[rdfweb-dev] advocating use of rdf:ID / rdf:about attributes on foaf:Person tags

Libby Miller Libby.Miller at bristol.ac.uk
Tue Aug 19 08:42:56 UTC 2003

hi Jim, Peter

We use the W3C's profile of ISO 8601 in the calendar work:


except for the slight difference that we do not allow the -0500 etc
construct to represent timezones, as this is not allowed in iCalendar,
on which we based the RDF Calendar work.

In RDF calendar you can have Date or DateTime, but in iCalendar there
are also a bunch of components of datetime like date-month,
date-fullyear: see


the only reason these are not in the schema is that they have never
appeared in any test data - our schema is generated from testdata:


if we had testcases showing the use of these they could appear in the

The other possibliity is using the W3C XML schema datatypes, which also
I think include these types of data components. A final complication is
that we realized recently that our timezone handling may require that we
change the way we describe our dataes and times. This is an ongoing

Essentially, if people really want to use this stuff, we can do some
more work on it in the calendar group; in fact we have a meeting this
week on Wednesday:


bear in mind though that there are many other time ontologies


On Mon, 18 Aug 2003, Jim Ley wrote:

> "Peter Saint-Andre" <stpeter at jabber.org>
> > On Sun, Aug 17, 2003 at 03:55:26AM -0000, Jim Ley wrote:
> >
> > > For your birthDate, I think you need to specify more than "normally in
> ..."
> > > because that's not really useful unless we can rely on it to actually be
> in
> > > that format, specifying ISO 8601 would make more sense.
> >
> > Given previously-voiced concerns, we'd probably want to have birthDay
> > (mm-dd) and birthYear (yyyy). We'd also want to settle on one particular
> > profile of ISO 8601 (e.g., do we include separators such as the hyphens
> > between month and day?).
> I like the flexibility ISO8601 gives, it allows us to not give the year, or
> even not give the date, so we're free to leave out anything we want, and
> still be an ISO8601 - I might be happy to give out my year of birth, but as
> I'm extremely adverse to birthday cards/presents* I don't want to give out
> my actual date.  I'd say the calendar date format, which I don't believe has
> any ambiguity would be appropriate.
> (although it might be better to just use the RDF calendar stuff, and
> whatever that uses, hopefully Libby or someone will pop-up now.)
> Jim.
> * This is actually true, I detest recieving presents/cards.
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