- From: Jeremy Carroll <jeremy@topquadrant.com>
- Date: Fri, 24 Sep 2010 15:57:11 -0700
- To: Bob Ferris <zazi@elbklang.net>
- CC: semantic-web@w3.org
Hi Bob I did the work that excluded xsd:duration. The problem is the XML Schema group were under time pressure and had to go to press before they had really finished. An unresolved issue was to do with questions like how many days in a month, or how many seconds in an hour? These issues were addressed in XPath2 I think http://www.w3.org/2007/xpath-datatypes http://www.w3.org/TR/xpath-datamodel/ Appendix C in particular and http://www.w3.org/TR/xpath-datamodel/#types-predefined These documents post-date the RDF and OWL1 recs that are the source of the exclusion. OWL in particular requires that you can tell whether two literal values are or are not the same. The duration datatype available in 2004 did not have that property. If these two duration datatypes are not in OWL2, personally I would regard that as a defect. Jeremy On 9/23/2010 8:06 AM, Bob Ferris wrote: > > I am a bit confused now, does this mean that a property with a range > of xsd:duration can't be a owl:DatatypeProperty? (e.g., it's a > fundamental datatype for signal processing modellings) >
Received on Friday, 24 September 2010 22:58:06 UTC