Re: Temporal reference system

2015-06-09 11:00 GMT+02:00 Svensson, Lars <L.Svensson@dnb.de>:

> Frans,
>
> On Friday, June 05, 2015 4:41 PM, Frans Knibbe wrote:
>
> > Is everyone happy with the way the requirement is phrased now?
> >
> > "If a temporal reference is used, the description of the temporal
> reference
> > system (e.g. Unix date, Gregorian Calendar, Japanese Imperial Calendar,
> > Carbon Date, Geological Date) needs to be referenceable online."
>
> Does this imply a default TRS if none is mentioned, similar to the CRS in
> WKT (or is that orthogonal to this requirement)?
>

I don't think so. This is only about cases where a TRS is used.
But isn't it true that if data types like xsd:dateTime or xsd:sgYear are
used the TRS is implicit? I think there is a differene here with spatial
data, where it is possible to say that coordinates are latitude and
longitude without it being clear which CRS is used.

By the way, our requirement(s) for default CRS are not clear yet.

The question asked here does seem to hint at the requirement not being
clear yet. Is there is way it could be improved?

Regards,
Frans



>
> Best,
>
> Lars
> >
> >
> > 2015-06-05 1:23 GMT+02:00 <Simon.Cox@csiro.au>:
> > ... (moving from requirements into potential solution space) referencing
> a
> > description of the TRS is what is described in my proposed (backward
> > compatible) amendment to OWL-Time.
> > See http://def.seegrid.csiro.au/ontology/time/new and
> http://www.semantic-
> > web-journal.net/content/time-ontology-extended-non-gregorian-calendar-
> > applications-0
> >
> > Simon Cox | Research Scientist
> > CSIRO Land and Water
> > PO Box 56, Highett Vic 3190, Australia
> > Tel +61 3 9252 6342 | Mob +61 403 302 672
> > simon.cox@csiro.au | http://people.csiro.au/C/S/Simon-Cox
> >
> > ________________________________________
> > From: Alejandro Llaves [allaves@fi.upm.es]
> > Sent: Tuesday, 2 June 2015 9:54 PM
> > To: Andrea Perego
> > Cc: Ed Parsons; Frans Knibbe; SDW WG Public List
> > Subject: Re: Temporal reference system
> > Ok, I will rephrase the requirement and add some examples.
> >
> > Alejandro
> >
> > On 2 June 2015 at 00:19, Andrea Perego <andrea.perego@jrc.ec.europa.eu>
> > wrote:
> > On Fri, May 29, 2015 at 12:38 PM, Ed Parsons <eparsons@google.com>
> wrote:
> > > I like the approach of treating this in the same way as CRS, if a
> temporal
> > > reference is used, the description of that system needs to be
> referenceable
> > > online.
> >
> > +1 also from me.
> >
> > Andrea
> >
> >
> >
> >
> > --
> > Alejandro Llaves
> > Ontology Engineering Group (OEG)
> > Artificial Intelligence Department
> > Universidad Politécnica de Madrid
> > Avda. Montepríncipe s/n
> > Boadilla del Monte, 28660 Madrid, Spain
> >
> > http://www.oeg-upm.net/index.php/phd/325-allaves
> >
> > allaves@fi.upm.es
> >
> >
> >
> >
> > --
> > Frans Knibbe
> > Geodan
> > President Kennedylaan 1
> > 1079 MB Amsterdam (NL)
> >
> > T +31 (0)20 - 5711 347
> > E frans.knibbe@geodan.nl
> > www.geodan.nl
> > disclaimer
>
>