RE: [RSS-DEV] Expressing date range in coverage

["Danny Ayers" <danny666@virgilio.it>]

Yep, this looks very useful. Personally I'd favour the DCMI Period XML style
[1], likewise Point etc [2] something like :

<dc:coverage>
<dc:Period>
        <dc:start>2002-09-20T20:01:19Z</start>
        <dc:end>2002-11-01T23:39:19Z</end>
</dc:Period>
<dc:Point dc:east="-77.12" dc:north="38.99" dc:projection="WGS84"
dc:name="Bethesda, MD USA"</dc:Point>
</dc:coverage>

DCSV makes me shudder - yet another parser required (this gets on my nerves
with CSS/SVG).

re. where these could be used - anywhere where it made sense! Period for
channel would probably be the most useful.

Cheers,
Danny.

[1] http://dublincore.org/documents/dcmi-period/#sec3-2

[2] http://dublincore.org/documents/2000/07/11/dcmi-point/

btw, when I searched for point I got pointed to
 http://purl.org/DC/documents/rec/dcmi-point-20000728.htm
but the page isn't there - and this is for locating something??!

-----------
Danny Ayers

Semantic Web Log :
http://www.citnames.com/blog

"The lyf so short, the craft so long to lerne." - Chaucer



>-----Original Message-----
>From: Bill Kearney [mailto:wkearney99@hotmail.com]
>Sent: 29 November 2002 17:51
>To: rss-dev
>Cc: syndication
>Subject: [RSS-DEV] Expressing date range in coverage
>
>
>Hi all,
>
>I think I've found something that might be useful when added to an
>RSS feed.
>
>The Dublin Core supports an element called "coverage".  It can be used to
>express a range of time.  At it's most basic this could be used to
>indicate what
>range of time the items within the feed instance cover.
>
>This could be formed using DCSV formatting:
><dc:coverage>start=2002-09-20T20:01:19Z;
>end=2002-11-01T23:39:19Z;</dc:coverage>
>
>Or as:
><dc:coverage start="2002-09-20T20:01:19Z" end="2002-11-01T23:39:19Z" />
>
>Or even:
><dc:coverage>
>    <start>2002-09-20T20:01:19Z</start>
>    <end>2002-11-01T23:39:19Z</end>
></dc:coverage>
>
>DCMI Period using coverage allows for a lot more than just
>timestamp ranges.
>There's a way to express schemes as well.  I'm not terribly
>interested in the
>alternative scheme possibilities as they're not terribly likely to
>be useful in
>a newsfeed context.  I suppose the Caesar weblog might use another
>one. But for
>the staggering majority just using W3CDTF (the default) scheme is quite
>adequate.
>
>The expectation here is this would be contained within the channel
>context.  I
>suppose it could be contained within the items context (the
>rdf:Seq) but that's
>probably more trouble than it's worth.  Semantically this would
>indicate that
>this particular channel instance contains elements spanning from
>the start to
>the end timestamps.  This could be quite useful to something
>looking to 'keep
>current' with a feed.  It'd also be a possible step toward doing fractional
>retreival of feeds.  As in, you could ask a mythical dynamic feed
>server to hand
>you a feed "covering" a given start/end range.
>
>I'm sure there's even several other ways to express it.  I'm
>wondering what most
>developers would consider to be the 'least painful' way to format
>it?  What's
>the consensus on formatting it for good RDF-ness?
>
>-Bill Kearney
>
>
>http://dublincore.org/documents/dcmi-period/#dcsv
>
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