[GeoNetwork-devel] Dealing with time in GML part 2

ticheler · September 11, 2007, 1:54pm

Hi All,
In addition to what I wrote earlier, I figured that what does validate (in GeoNetwork) is the following construction:

    <gmd:extent>
        <gmd:EX_Extent>
          <gmd:temporalElement>
            <gmd:EX_TemporalExtent>
              <gmd:extent>
                <gml:TimePeriod gml:id="ID001">
                  <gml:beginPosition>2004-01-10T12:00:00</gml:beginPosition>
                  <gml:endPosition>2007-09-10T12:00:00</gml:endPosition>
                </gml:TimePeriod>
              </gmd:extent>
            </gmd:EX_TemporalExtent>
          </gmd:temporalElement>
        </gmd:EX_Extent>
      </gmd:extent>

Now this is pretty much what we already used, except that the TimePeriod element requires the gml:id attribute with some formatted content to actually pass the validation. I put gml:id="ID001" in the above sample and that does the job. Sorry for my ignorance, but why is this supposed to be there? What is the idea behind the identifier and could I just put anything I wanted in there?

Ciao,
Jeroen

Ron_Lake · October 16, 2007, 5:24am

Hi,

gml:id is a resource identifier - in a WFS it provides a handle to get
back the associated GML entity (geometry, feature, time period etc). It
is like an object id or like a primary key in a relational DBMS. The
assignment of the id is made by the resource owner.

Sincerely,

Ron

-----Original Message-----
From: Jeroen Ticheler [mailto:Jeroen.Ticheler@anonymised.com]
Sent: September 11, 2007 6:54 AM
To: geonetwork-devel@lists.sourceforge.net
Subject: Dealing with time in GML part 2

Hi All,
In addition to what I wrote earlier, I figured that what does
validate (in GeoNetwork) is the following construction:

    <gmd:extent>
        <gmd:EX_Extent>
          <gmd:temporalElement>
            <gmd:EX_TemporalExtent>
              <gmd:extent>

<gml:TimePeriod gml:id="ID001">

<gml:beginPosition>2004-01-10T12:00:00</gml:beginPosition>

<gml:endPosition>2007-09-10T12:00:00</gml:endPosition>

</gml:TimePeriod>
              </gmd:extent>
            </gmd:EX_TemporalExtent>
          </gmd:temporalElement>
        </gmd:EX_Extent>
      </gmd:extent>

Now this is pretty much what we already used, except that the
TimePeriod element requires the gml:id attribute with some formatted
content to actually pass the validation. I put gml:id="ID001" in the
above sample and that does the job. Sorry for my ignorance, but why
is this supposed to be there? What is the idea behind the identifier
and could I just put anything I wanted in there?

Ciao,
Jeroen

Ted_Habermann · December 29, 2007, 5:55pm

Jeroen,

Thanks for this time example, it helps quite a bit. One question: is there
supposed to be a <gmd:extent> (on line 5) embedded in another <gmd:extent>
(on line 1)?

Thanks,
Ted Habermann

Jeroen Ticheler-3 wrote:

Hi All,
In addition to what I wrote earlier, I figured that what does
validate (in GeoNetwork) is the following construction:

    <gmd:extent>
        <gmd:EX_Extent>
          <gmd:temporalElement>
            <gmd:EX_TemporalExtent>
              <gmd:extent>
                <gml:TimePeriod gml:id="ID001">
                  <gml:beginPosition>2004-01-10T12:00:00</gml:beginPosition>
                  <gml:endPosition>2007-09-10T12:00:00</gml:endPosition>
                </gml:TimePeriod>
              </gmd:extent>
            </gmd:EX_TemporalExtent>
          </gmd:temporalElement>
        </gmd:EX_Extent>
      </gmd:extent>

Now this is pretty much what we already used, except that the
TimePeriod element requires the gml:id attribute with some formatted
content to actually pass the validation. I put gml:id="ID001" in the
above sample and that does the job. Sorry for my ignorance, but why
is this supposed to be there? What is the idea behind the identifier
and could I just put anything I wanted in there?

Ciao,
Jeroen

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