[georss] "When" information in georss

Mon Aug 6 21:03:07 EDT 2007

I should also note that the IETF working group that is setting internet 
standards at the infrastructure level (levels 4 through 7) for the 
expression of non-binary location payloads and related privacy has agreed to 
use a GML application schema. This schema is an OGC Best Practices document. 
If you want more information, check out internet standard 
http://www.ietf.org/rfc/rfc4119.txt - PIDF (Presence Information Data 
Format) and the draft internet 
http://www.ietf.org/internet-drafts/draft-ietf-geopriv-http-location-delivery-01.txt 
(HELD) as examples. Also check out the use of GML with SIP (Session 
Initiation Protocol). FYI, SIP is used most anytime anyone uses VOIP (except 
for Vonage - if they had used SIP, they would not be in court right now). It 
is interesting to google "SIP session voip gml" and see who is doing what 
with SIP and GML.

So, why am I providing this information? The majority of the use cases for 
this work have to do with alerting, emergency services, and so forth. And 
time has also been  major discussion item for this group.

One of my personal goals is to help achieve a high level of consistency in 
the broader ICT community for the use and expression of geography/location 
in all standards being developed by any standards organizations that has a 
requirement to express location. So, if I come on a bit strong on this 
topic, you now know why :-)

Regards

Carl

----- Original Message ----- 
From: "Ron Lake" <rlake at galdosinc.com>
To: "Andrew Turner" <ajturner at highearthorbit.com>; "Carl Reed OGC Account" 
<creed at opengeospatial.org>
Cc: <georss at lists.eogeo.org>
Sent: Monday, August 06, 2007 6:35 PM
Subject: RE: [georss] "When" information in georss

> Hi Andrew:
>
> Are you agreeing or disagreeing with Carl?
>
> R
>
> Ron Lake
> CEO and Chairman
> Galdos Systems Inc
> +1-604-484-2751
> Be there when GIS and the Web unite! Register now for GeoWeb 2007 at
> www.geoweb.org
>
>
> -----Original Message-----
> From: georss-bounces at lists.eogeo.org
> [mailto:georss-bounces at lists.eogeo.org] On Behalf Of Andrew Turner
> Sent: August 6, 2007 1:33 PM
> To: Carl Reed OGC Account
> Cc: georss at lists.eogeo.org
> Subject: Re: [georss] "When" information in georss
>
> On 8/6/07, Carl Reed OGC Account <creed at opengeospatial.org> wrote:
>> Why not GML? There is a rapidly growing international movement in
> various
>> scientific and research communities (such as Oceans monitoring and
>> environmental monitoring) to enable and make web accessible (via
> standard
>> interfaces) numerous sensor networks using the new OGC Sensor
> Observation
>> Service (SOS) and/or WFS. Both return GML responses.
>
> The primary reason was approachability and understandability by a
> broad range of developers. i.e. someone creating a feed about concert
> events.
>
> Rons post does a good succint job of a simple example:
>
> http://geoweb.blog.com/494471/
> <gml:TimePeriod>
>    <gml:begin>2003-02-13T12:28-08:00</gml:begin>
>    <gml:end>2003-02-13T12:30-08:00</gml:end>
> <gml:TimePeriod>
>
> Also worth pointing out is the the GML TimePeriod uses ISO8601, and
> Atom uses RFC3339 - which is a subset of ISO8601. so that jives nicely
> with Atom
>
>
>> Would be nice to be consistent.
>>
>> Just wondering.
>>
>> Carl
>>
>> ----- Original Message -----
>> From: "Andrew Turner" <ajturner at highearthorbit.com>
>> To: "Sean Gillies" <sgillies at frii.com>
>> Cc: <georss at lists.eogeo.org>
>> Sent: Wednesday, August 01, 2007 4:15 PM
>> Subject: Re: [georss] "When" information in georss
>>
>>
>> > b/c the current Time specification doesn't actually specify
> including
>> > the time element in the response. This is similar to the Geo that
> uses
>> > GeoRSS, and not OpenSearch-Geo, to specify the geographic search
>> > parameters.
>> >
>> > I was hoping for a more generic definition of time (not even
>> > necessarily bound to geo* - so not GML), but RSS or Atom don't
> support
>> > that it appears (which is actually kind of surprising?
>> >
>> > On 8/1/07, Sean Gillies <sgillies at frii.com> wrote:
>> >> Andrew Turner wrote:
>> >> > On 7/29/07, Sean Gillies <sgillies at frii.com> wrote:
>> >> >> The time period that the feed is valid for for ... that would be
>> >> >> published/updated up until *now* right? It seems that the best
> way to
>> >> >> indicate a future limit would be for the feed's origin server to
> set
>> >> >> an
>> >> >> "Expires" HTTP header. That would be going with the grain of the
> Web.
>> >> >
>> >> > I may have requested a feed for another, arbitrary time period,
> say
>> >> > 4-20-2007 > 5-15-2007
>> >> >
>> >> > And relying on just the HTTP headers means that I then lose that
>> >> > information if I store the file. So like GeoRSS feeds can have a
>> >> > geometry that applies to the entire feed, it would be nice to use
> the
>> >> > timespan to define a timespan for the entire feed. This is
> especially
>> >> > important if I request a feed for that month, even if there are
> only
>> >> > items for a week in the middle. The feed still is of the entire
> month.
>> >> >
>> >> > Brian - can you put that example as a page on the GeoRSS CMS?
>> >> >
>> >> > Thanks,
>> >> > Andrew
>> >> >
>> >>
>> >> Andrew,
>> >>
>> >> Assuming you're using OpenSearch to request a feed using a temporal
>> >> query, could you not rely on the os:Query element that you would
> include
>> >> in the response?
>> >>
>> >> Sean
>> >>
>> >> _______________________________________________
>> >> georss mailing list
>> >> georss at lists.eogeo.org
>> >> http://lists.eogeo.org/mailman/listinfo/georss
>> >>
>> >
>> >
>> > --
>> > Andrew Turner
>> > ajturner at highearthorbit.com      42.2774N x 83.7611W
>> > http://highearthorbit.com              Ann Arbor, Michigan, USA
>> > Introduction to Neogeography -
> http://oreilly.com/catalog/neogeography
>> > _______________________________________________
>> > georss mailing list
>> > georss at lists.eogeo.org
>> > http://lists.eogeo.org/mailman/listinfo/georss
>>
>>
>
>
> -- 
> Andrew Turner
> ajturner at highearthorbit.com      42.2774N x 83.7611W
> http://highearthorbit.com              Ann Arbor, Michigan, USA
> Introduction to Neogeography - http://oreilly.com/catalog/neogeography
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