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

update to data model and Time specifications to reuse in POI

From: Raj Singh <rsingh@opengeospatial.org>
Date: Mon, 31 Oct 2011 09:52:29 -0400
Message-Id: <1013F45B-D1B4-40FB-8483-E0B9ADB0B13F@opengeospatial.org>
To: "public-poiwg@w3.org W3C" <public-poiwg@w3.org>
I put some thought into the time object this weekend. As Karl says, we want to keep it pretty simple as core POI should be a least-common-denominator standard that is accessible to every information community. I added a time term of "instant" based on the KML TimeStamp. I didn't see a pressing need to anything from GML.  

Working with the model I also noticed that we were limiting description to none or one value. I changed this to allow for multiple descriptions. I also changed author to 0..1 instead of 0..*. This makes relational database implementations a little easier, and author can be nested within author, so this should be just as flexible as before. I also made author a POITermType so that we could tag it with terms like primary, secondary, contributor, editor. etc.

As always, it's posted to:

The OGC: Making location count...

On Oct 27, at 4:08 PM, Seiler, Karl wrote:

> To bring us back to the primary use cases for time let's review the need, to ensure we are not over/undersope:
> 1. point in time for status changes - created on..., updated on..., delete on...
> 2. periods of time for place/location events - "Taste of Chicago" starts on... ends on... is bounded by this area...
> 3. collections of periods of time - hours of operations - closed Sun-Mon, open 8-6 T-F, open 10-2 Sat...
> _______________________________
> Karl Seiler
> Director Location Technology & Services
> NOKIA Location and Commerce - Chicago
> (T)  +312-894-7231
> (M) +312-375-5932
> -----Original Message-----
> From: Yarik [mailto:Iaroslav.Sheptykin@hs-bremen.de]
> Sent: Thursday, October 27, 2011 2:18 PM
> To: public-poiwg@w3.org W3C
> Cc: Raj Singh
> Subject: Time specifications to reuse in POI
> 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
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Received on Monday, 31 October 2011 13:52:59 UTC

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