ISSUE-172: Information content (section 7)

Information content (section 7)

State:

CLOSED

Product:

Time ontology in OWL

Raised by:

Simon Cox

Opened on:

2017-04-12

Description:

Section 7 says in part:

... the advantage of using DateTimeDescription is that it can express more information than dateTime, such as ‘week’, ‘day of week’ and ‘day of year’, so in the above example, we can also know that 01/01/2006 is Sunday, on the first day of the year, and in the first week of the year.

The problem with this proposition is that the day of the week, and the week number, do not constitute additional information; the nature of the Gregorian calendar and any systematic week-numbering system is such that if the date is known, then the day of the week and the week number are necessarily also known, and can be calculated algorithmically. So the claim that a dateTime description “can express more information” than the XSD dateTime type seems to be simply false, unless the nature of dateTime descriptions is such that they are not tied to a particular calendar, in which case it is not clear that they are usable for conventional date/time information.

Related Actions Items:

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Related emails:

1. RE: OWL-Time - ISSUE-172: Information content (section 7) (from chris.little@metoffice.gov.uk on 2017-04-13)
2. OWL-Time - ISSUE-172: Information content (section 7) (from Simon.Cox@csiro.au on 2017-04-12)

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