- From: Isabelle Augenstein <i.augenstein@sheffield.ac.uk>
- Date: Mon, 10 Feb 2014 14:58:55 +0000
- To: Jerven Bolleman <me@jerven.eu>, Heiko Paulheim <heiko@informatik.uni-mannheim.de>
- CC: semantic-web@w3.org, "public-lod@w3.org community" <public-lod@w3.org>, Bernd Opitz <opitz.bernd@gmail.com>
Hi Heiko, The Timex3 standard for temporal expressions [1], as widely used for linguistic analysis, suggests 'XX' if the date or month is unknown. I'm not aware if people are using that to encode temporal expressions in Linked datasets, but it would definitely be a better solution than using '01' for unknown days or months. Best wishes Isabelle [1] http://www.timeml.org/site/publications/timeMLdocs/timeml_1.2.1.html#timex3 -- Isabelle Augenstein, Department of Computer Science, The University of Sheffield, Regent Court, 211 Portobello, S1 4DP, Sheffield, UK Tel: +44(0) 1442221876, Fax: +44(0)1142221810 www: http://staffwww.dcs.shef.ac.uk/people/I.Augenstein/ On 10/02/2014 14:43, Jerven Bolleman wrote: > Hi Heiko, > > http://www.w3.org/TR/xmlschema-2/#gYear and http://www.w3.org/TR/xmlschema-2/#gYeargYearMonth > are the datatypes that you should use. > > Regards, > Jerven > > On 10 Feb 2014, at 15:37, Heiko Paulheim <heiko@informatik.uni-mannheim.de> wrote: > >> Hi all, >> >> xsd:dateTime and xsd:date are used frequently for encoding dates in RDF, e.g., for birthdays in the vcard ontology [1]. Is there any best practice to encode incomplete date information, e.g., if only the birth *year* of a person is known? >> >> As far as I can see, the XSD spec enforces the provision of all date components [2], but "1997-01-01" seems like a semantically wrong way of expressing that someone is born in 1997, but the author does not know exactly when. >> >> Thanks, >> Heiko >> >> [1] http://www.w3.org/2006/vcard/ns >> [2] http://www.w3.org/TR/xmlschema-2/#dateTime >> [3] http://www.w3.org/TR/xmlschema-2/#date >> >> -- >> Dr. Heiko Paulheim >> Research Group Data and Web Science >> University of Mannheim >> Phone: +49 621 181 2646 >> B6, 26, Room C1.08 >> D-68159 Mannheim >> >> Mail: heiko@informatik.uni-mannheim.de >> Web: www.heikopaulheim.com >> >> >
Received on Monday, 10 February 2014 14:59:59 UTC