[georss] Time and Space

Mon Feb 12 15:00:36 EST 2007

Gotta sign off here .. perhaps someone else more skilled in crafting GML could show an example?

----- Original Message ----
From: "Knoth, Brian D." <bknoth at mitre.org>
To: Mikel Maron <mikel_maron at yahoo.com>; georss at lists.eogeo.org
Sent: Monday, February 12, 2007 7:58:51 PM
Subject: RE: [georss] Time and Space

Mikel,

What you say in your second paragraph is exactly what we 
are looking for (well, with the addition of time also), but I'm a little 
confused by it because I thought that the GML geoRSS was defined to be only 
those GML elements defined here: http://www.georss.org/gml.html and 
not "any" GML payload. Also, I did not think that multiple ones could be present 
in there.

Could you give me a specific example of a 
<georss:where> node with multiple geometries and is compliant with the GML 
geoRSS definition?

thanks,

brian

  From: Mikel Maron 
  [mailto:mikel_maron at yahoo.com] 
Sent: Monday, February 12, 2007 2:50 
  PM
To: Knoth, Brian D.; georss at lists.eogeo.org
Subject: 
  Re: [georss] Time and Space

  Brian

There 
  was a thread on this last month that went into the issues .. http://lists.eogeo.org/pipermail/georss/2007-January/

But 
  I should've been more specific .. you can include any kind of GML payload in 
  GeoRSS GML, which could have multiple geometries,
but those all would be 
  included in a single georss:where.

-Mikel

  ----- 
  Original Message ----
From: "Knoth, Brian D." 
  <bknoth at mitre.org>
To: Mikel Maron <mikel_maron at yahoo.com>; 
  georss at lists.eogeo.org
Sent: Monday, February 12, 2007 7:41:39 
  PM
Subject: RE: [georss] Time and Space

  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&sessionId=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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