[georss] Time and Space

[Knoth, Brian D.]

Mikel,
 
I'll take a look at your links in a moment, but just quickly wanted to
respond to the issue of not being able to have multiple <georss:where>
nodes under an <item>. I know that I read this restriction somewhere
else and my only question is simply why not?  I don't know of any
restriction defined in the RSS specification that limits child elements
to only a single occurrence, is there?
 
thanks,
brian


________________________________

	From: Mikel Maron [mailto:mikel_maron at yahoo.com] 
	Sent: Monday, February 12, 2007 2:38 PM
	To: Knoth, Brian D.; georss at lists.eogeo.org
	Subject: Re: [georss] Time and Space
	
	
	Hi Brian
	
	I'm very interested in incorporating time, visualizing and
acting on change. Gave a presentation outlining some thoughts on this
foss4g..
	
http://www.foss4g2006.org/contributionDisplay.py?contribId=161&sessionI
d=47&confId=1
	
	Like Raj, I think time could be seen as having wider
application than just space. I've re-used the RSS and Atom
time-oriented fields for some
	basic stuff.
	
	http://worldkit.org/doc/time.php
	
	For richer time specifications, there hasn't been agreement on
a single encoding. Upcoming.org has a bit to say on this..
	
	
http://community.upcoming.org/w/index.php/Nerdy_Questions#What_are_the_
guidelines_you_follow_when_creating_RSS_feeds.3F
	
	They're using xCal. There's also an old RSS 1.0 module called
Event .. http://web.resource.org/rss/1.0/modules/event/
	
	
	While writing this I just saw your followup. One thing about
your usage, you can't associate multiple georss:where elements with a
single item;
	it's a one to one relationship. 
	
	Best
	-Mikel
	
	
	----- Original Message ----
	From: "Knoth, Brian D." <bknoth at mitre.org>
	To: georss at lists.eogeo.org
	Sent: Monday, February 12, 2007 1:40:54 PM
	Subject: [georss] Time and Space
	
	
	Hi,
	
	I'm new to this mailing list, yet have been advocate of RSS and
geoRSS
	on some internal projects for a while. I do have a few concerns
with
	regard to real practical acceptance of geoRSS, yet, I
understand the
	need to try and balance simplicity and expressiveness. As such,
we are
	attempting to utilize GML geoRSS, however, we have needed to
extend the
	GML geoRSS with the ability identify time as well as space. 
	
	I wanted to just send out our approach to doing this to get
comments
	from anyone else who might be interested in this on the mailing
list.
	Simply put, we have added a GML TimePeriod to each of the
geoRSS nodes
	along with the spatial representation. Here is an example:
	
	<georss:where>
	    <gml:TimePeriod>
	           <gml:begin>2006-06-17T09:55:00Z</gml:begin>
	        <gml:end>2006-06-17T10:30:00Z</gml:end>
	    </gml:TimePeriod>
	    <gml:Point>
	        <gml:pos>37.65356495497155 -114.5048399056895</gml:pos>
	    </gml:Point>
	</georss:where>
	
	All comments would be appreciated.
	
	Regards,
	brian
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