W3C home > Mailing lists > Public > public-html-data-tf@w3.org > November 2011

Re: <time> values in HTML5

From: John Cowan <cowan@mercury.ccil.org>
Date: Tue, 22 Nov 2011 14:32:54 -0500
To: Liam R E Quin <liam@w3.org>
Cc: tantek@cs.stanford.edu, Jeni Tennison <jeni@jenitennison.com>, www-xml-schema-comments@w3.org, HTML Data Task Force WG <public-html-data-tf@w3.org>, RDFa WG <public-rdfa-wg@w3.org>, public-html-xml@w3.org
Message-ID: <20111122193254.GD1733@mercury.ccil.org>
Liam R E Quin scripsit:

> Year-Week-Day can easily map into an existing type, of course, as can
> Year-Week, if one takes just the first day of the week as the point to
> map.

By the same token, you could map gYears onto a date (September 22, say)
and gYearMonths too (onto the Ides, for example).  But the interval
meaning of these types is extensional, not intensional:  "1066" as a
gYear means the whole of that year, and not merely, say, October 14 at
0900 UTC.

> The bigger aspect is that if the "time" element is there to do
> iCal-like work, it needs to represent things like recurring events,
> and XSD lacks that concept, and so do the other specs using XSD for
> their type system,

They are not entirely absent: gMonth, gMonthDay, and time are recurring
intervals.  But it's true that *general* recurring intervals are lacking.

> One such change might be to have the XSD spec link to a public
> registry a bit like the XPointer registry, but for new Schema types.

That seems a fine idea, provided it is understood that implementing the
registry is not a conformance requirement, merely a SHOULD.

> This also raises the question, long term, of what to do about future
> change requests to XSD after the current WG has closed.

Adopt DTLL while you still can?

John Cowan      http://www.ccil.org/~cowan      cowan@ccil.org
Be yourself.  Especially do not feign a working knowledge of RDF where
no such knowledge exists.  Neither be cynical about RELAX NG; for in
the face of all aridity and disenchantment in the world of markup,
James Clark is as perennial as the grass.  --DeXiderata, Sean McGrath
Received on Tuesday, 22 November 2011 19:33:21 UTC

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