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RE: Time ontology extension for non-Gregorian calendars

From: Little, Chris <chris.little@metoffice.gov.uk>
Date: Wed, 27 May 2020 14:34:59 +0000
To: Peter Parslow <Peter.Parslow@os.uk>, Élie Roux <elie.roux@telecom-bretagne.eu>, "Ronald Henry Tse (tse@ribose.com)" <tse@ribose.com>
CC: "public-sdwig@w3.org" <public-sdwig@w3.org>
Message-ID: <CWXP265MB00530D73F00EDC116A15DEADA7B10@CWXP265MB0053.GBRP265.PROD.OUTLOOK.COM>
Dear Élie,

The SDWIG is the successor to the SDW WG that produced the updated W3C Time Ontology, and you have had a productive conversation with Simon Cox about that.

You should also be aware that Ron Tse, from Hong Kong, is also involved in ISO temporal things, and is on the committee (ISO TC154/WG5) that maintains the 'labelling' or 'tagging' code standards for:
 country names (ISO 3166),
 currencies  (ISO4217),
 languages (ISO639), and
 time (ISO8601).

Last year, they published two technical reports on codes/labels for timescales (such as TAI atomic time, GPS, Galileo, etc) and calendars (ISO/PWI 34300).   This latter may be relevant to you interest. 

I assume you know about the Unicode calendar XML-based resources at https://www.unicode.org/reports/tr35/tr35-31/tr35-dates.html 

HTH, Chris

-----Original Message-----
From: Peter Parslow <Peter.Parslow@os.uk> 
Sent: 21 May 2020 13:16
To: Élie Roux <elie.roux@telecom-bretagne.eu>; public-sdwig@w3.org
Subject: RE: Time ontology extension for non-Gregorian calendars

Dear Élie,
ISO 19108:2002 "Geographic information - Temporal schema" standardises a number of concepts for expressing time other than in the Gregorian calendar. I have no experience of using these parts, so I can't really say how complete or appropriate they are.

There is an attempt at expressing it as an ontology (in RDF/OWL) at https://def.isotc211.org/ontologies/iso19108/. The project that is part of has been criticised; as the RDF/OWL is generated automatically from UML models, it isn't ideal. But it should give you an idea of whether the concepts defined there are useful to you.

The UML is available at http://iso.sparxcloud.com/index.php; the document is sold by ISO and (in France) AFNOR; it may be available through your organisation or public library.

I hope that helps.

Peter Parslow
OS Open Standards Lead
Adanac Drive, Southampton, United Kingdom, SO16 0AS
T: +44 (0)2380 055341 | M: +44 (0)7796 610020 www.os.uk | peter.parslow@os.uk

-----Original Message-----
From: Élie Roux <elie.roux@telecom-bretagne.eu>
Sent: 21 May 2020 12:52
To: public-sdwig@w3.org
Subject: Time ontology extension for non-Gregorian calendars

External Email: Take care with attachments & links.

Dear all,

I have a project of encoding date description in non-Gregorian calendars, mostly Chinese, Tibetan, South-East Asian and Indian. I started a small example with a few properties on


I would like to ask a few big picture questions about my idea:

- are there similar initiatives? (for any type of non-Gregorian calendar)

- would this working group host such an initiative?

- if not, what do you think the best course of action would be for me to have the most useful result?

- there are patterns that will be common to most non-Gregorian calendars (duplicate days and month, eras other than the Common Era, etc.), and it would seem strange to define properties in a scoped extension (such as the one I envision). Could these patterns be proposed as an extension to the Time Ontology? Or should there be a more general non-Gregorian Time Ontology that would cover these?

Thanks in advance,

Best Regards,
Elie Roux
Technical lead of Buddhist Digital Resource Center

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Received on Wednesday, 27 May 2020 14:35:16 UTC

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