Re: patterns and restrictions
[ Charset ISO-8859-1 unsupported, converting... ] > Hi, > > Does the following allow 'abc' as a valid value? > > <xs:simpleType name="MyDouble"> > <xs:restriction base="xs:double"> > <xs:pattern value="[^N].*"/> > </xs:restriction> > </xs:simpleType> > > We had been working under the belief that, via restriction - patterns > from both the new datatype and the original one are 'And'ed together. > i.e - the above datatype would only allow values valid for a double - > with the exception of NaN. > > However, we've read somewhere today that whenever a pattern facet is > evaluated - it is evaluated against a string. Though XMLSpy and Xerces The 'XML Schema Part 2: Datatypes' says NOTE: It is a consequence of the schema representation constraint Multiple patterns (?220.127.116.11) and of the rules for ?restriction? that ?pattern? facets specified on the same step in a type derivation are ORed together, while ?pattern? facets specified on different steps of a type derivation are ANDed together. 'pattern' is a constraining facet, and a type defined by applying a constraining facet to a primitive type is a derived type. Therefore, I would think that 'pattern' defines a subset of the lexical space of the type it is applied to. David Tolpin
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