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[Michael Anderson <michael@research.canon.com.au>] Restricting Facets

From: Henry S. Thompson <ht@cogsci.ed.ac.uk>
Date: 10 May 2000 09:09:07 +0100
To: www-xml-schema-comments@w3.org
Message-ID: <f5bn1lyltcs.fsf@cogsci.ed.ac.uk>

attached mail follows:

Is it possible to define a new simple type to constrain the pattern of a
time duration so that duration can at most be measured in days.  For
           <xsd:simpleType name="MyTimeDuration"
  value="-?P(\d+D)?(T(\d+H)?(\d+M)?(\d+(\.\d+)?S)?)?" />

According to the XML Schema working drafts, pattern facet is allowed for
timeDuration.  My interpretation is that any pattern facet, once
specified for a subtype of the timeDuration type, can further restrict
the format of timeDuration provided that it is still of a valid
timeDuration format.  Is
this correct?  Furthermore does the parser need to check this? ie check
that the pattern of  MyTimeDuration is indeed still a valid pattern for

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  Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh
          W3C Fellow 1999--2001, part-time member of W3C Team
     2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440
	    Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk
		     URL: http://www.ltg.ed.ac.uk/~ht/
Received on Wednesday, 10 May 2000 04:09:10 UTC

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