RE: Time ontology extension for non-Gregorian calendars

Well since it will involve some significant documentation as well as ontology changes, I think a short spec is required. 
Take a look at two 'extensions' that I already generated for consideration by the SDWIG - 
- whose sources are in 
- whose sources are in 
These might be models for you. 

From a technical perspective, there is a concern not to compromise 'backward compatibility' in the sense that data (individuals, a-box) that follow the current ontology do not become inconsistent or get harmful entailments as a consequence of a new axioms (t-box). Note the approach I took for the 2017 version of OWL-Time was to interpolate super-classes with more generalized definitions above the existing classes that were designed for the Gregorian Calendar. That is where those 'GeneralizedAAA' classes and 'GeneralBBB' datatypes came from. I suspect a similar strategy should be applied to support your use-cases. 

-----Original Message-----
From: √Člie Roux <> 
Sent: Monday, 25 May, 2020 04:18
Subject: Re: Time ontology extension for non-Gregorian calendars

> How about proposing specific changes to OWL-Time?

I'm very happy to do that yes! What would be the best way to document proposals and submit them?


Received on Monday, 25 May 2020 03:24:34 UTC