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   Restricting Facets

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  • From: Michael Anderson <michael@research.canon.com.au>
  • To: xml <xml-dev@xml.org>
  • Date: Wed, 10 May 2000 11:01:32 +1000

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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