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

RE: Time specifications to reuse in POI

From: Seiler, Karl <karl.seiler@navteq.com>
Date: Thu, 27 Oct 2011 15:08:31 -0500
To: Yarik <Iaroslav.Sheptykin@hs-bremen.de>, "public-poiwg@w3.org W3C" <public-poiwg@w3.org>
CC: Raj Singh <rsingh@opengeospatial.org>
Message-ID: <133ACBBC61BE0E4081B6E35E542ECE230F0FA7D0@hq-ex-mb03.ad.navteq.com>
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.

        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

        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:

                <modified id="" />...</modified>
                <modified id="upgraded">...</modified>
                <modified id="rebooted">...</modified>
                <modified id="decorated">...</modified>

        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

        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


The information contained in this communication may be CONFIDENTIAL and is intended only for the use of the recipient(s) named above.  If you are not the intended recipient, you are hereby notified that any dissemination, distribution, or copying of this communication, or any of its contents, is strictly prohibited.  If you have received this communication in error, please notify the sender and delete/destroy the original message and any copy of it from your computer or paper files.
Received on Thursday, 27 October 2011 20:09:03 UTC

This archive was generated by hypermail 2.4.0 : Friday, 17 January 2020 16:48:31 UTC