[auscope-geosciml] Nillable attributes in GeologicEvent [SEC=UNCLASSIFIED]

Oliver.Raymond at ga.gov.au Oliver.Raymond at ga.gov.au
Tue Aug 10 02:33:18 EDT 2010

This brings up a topic for the Rome meeting that was not really cleared up at Quebec.

1.  youngerNamedAge, olderNamedAge are effectively "nillable" by using an href to one of the OGC nil values URIs like

   <gt:youngerNamedAge xlink:href="http://www.opengis.net/def/nil/OGC/0/missing"/>

2.  numericAgeDate cannot be "nilled" by using xlink:href, but its 3 components (youngerBoundDate, olderBoundDate, reportingDate) can be.

         <cgu:reportingDate xlink:href="http://www.opengis.net/def/nil/OGC/0/missing"/>
         <cgu:olderBoundDate xlink:href="http://www.opengis.net/def/nil/OGC/0/witheld"/>
         <cgu:youngerBoundDate xlink:href="http://www.opengis.net/def/nil/OGC/0/unknown"/>
   <gt:youngerNamedAge xlink:href="http://www.opengis.net/def/nil/OGC/0/missing"/>
   <gt:olderNamedAge xlink:href="http://www.opengis.net/def/nil/OGC/0/missing"/>

3.  Alternatively, I could change the GeologicAge schema so that all the three GeologicEvent attributes are nillable like this:

   <gt:numericAgeDate nil="true" nilReason="missing"/>
   <gt:youngerNamedAge nil="true" nilReason="witheld"/>
   <gt:olderNamedAge nil="true" nilReason="unknown"/>

(Note that the 'nilReason' attribute is only available in GML3.2 schemas)

So, at Rome (or earlier via email) we need to decide and document which path we are going to adopt for nillable elements.


PS. https://www.seegrid.csiro.au/twiki/bin/view/AppSchemas/NilValues for Simon's description of the options.

PPS.  Marcus, given that a "nil value URI" solution is currently available in the v3 RC1 schemas, I have decided for the moment not to change the GeologicAge.xsd or Value.xsd schemas before discussion at Rome.

-----Original Message-----
From: Raymond Oliver
Sent: Tuesday, 10 August 2010 11:28 AM
To: 'auscope-geosciml at lists.arcs.org.au'
Subject: RE: Age properties of GeologicEvent [SEC=UNCLASSIFIED]

Yes, but nillable.  FullMoon has not processed the nil tags, so I will insert them in the schema by hand.  I have a few things to fix in the schemas and some time this afternoon, so schema updates hopefully available tomorrow.


Ollie Raymond

National Advice, Maps and Data Standards Project
Geoscience Australia

GeoSciML Design Group
IUGS Commission for the Management and Application of Geoscience Information


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-----Original Message-----
From: auscope-geosciml-bounces at lists.arcs.org.au [mailto:auscope-geosciml-bounces at lists.arcs.org.au] On Behalf Of Sen, Marcus A
Sent: Monday, 9 August 2010 11:33 PM
To: auscope-geosciml at lists.arcs.org.au
Subject: [auscope-geosciml] Age properties of GeologicEvent

Are all three age properties (numericAgeDate, youngerNamedAge, olderNamedAge) supposed to be mandatory properties of GeologicEvent?


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