W3C home > Mailing lists > Public > public-poiwg@w3.org > October 2011

Time specifications to reuse in POI

From: Yarik <Iaroslav.Sheptykin@hs-bremen.de>
Date: Thu, 27 Oct 2011 21:18:22 +0200
Message-ID: <1319743102.3409.39.camel@prime>
To: "public-poiwg@w3.org W3C" <public-poiwg@w3.org>
Cc: Raj Singh <rsingh@opengeospatial.org>
Hi everyone!

        In one of the last emails Raj has found the idea of having a
        review of time specs good.
        http://lists.w3.org/Archives/Public/public-poiwg/2011Oct/0029.html
        
        I gave it a try but didn't go far. I have started from taking a
        look what GML and KML did in support of temporal attributes of
        their data. 
        
        KML has two time types: TimeStamp and TimeSpan. Both extend
        abstract TimePrimitive. TimePrimitive is included into the
        Feature type and inherited by PlaceMark, NetworkLink, Overlays,
        Folder and Document. The geometry is not temporally enabled. 
        more at
        http://code.google.com/apis/kml/documentation/kmlreference.html
        Learning from KML we could add an abstract type Time to the
        POIBaseType. Created, Modified, Deleted could extend Time. We
        could allow Created and Deleted appear 1 and 0..1 respectively
        within its parent. Modified could appear 0 .. *. Ex:
        
                <created>...</created>
                <modified id="" />...</modified>
                <modified id="upgraded">...</modified>
                <modified id="rebooted">...</modified>
                <modified id="decorated">...</modified>
        	<deleted>...</deleted>
        
        GML takes it more seriously. Similarly to KML it has TimeInstant
        and TimePeriod types. Additionally it allows defining relations
        between time instances. It implements calendars. 
        GML Temporal XSD
        http://schemas.opengis.net/gml/3.2.1/temporal.xsd
        Learning from GML we could consider using calendars and
        relations. Also, as the model already suggest, we could add
        temporal dimension to the geometry as well, which I believe GML
        developers would find a great idea.
        
        I am interested in reviewing other sources such as standards or
        papers which provide guidelines for the temporal modeling. If
        you have any in mind, or know a community that could provide
        further hits please share. I could summarize it afterwards in a
        wikipage.
        
Greets,
Yarik
Received on Thursday, 27 October 2011 19:19:02 UTC

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