minLength=1 on a type derived from NMTOKENS
The Saxon XSLT and XQuery processor, developed by Saxonica
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The three built-in list types NMTOKENS, IDREFS, and ENTITIES all impose a minumum length of 1. This constraint is not being carried through to user-defined list types derived by restriction from one of these three types.
A patch on the 9.1 branch is being placed in the Saxon-SA Subversion repository. Affects modules UserSimpleType and UserListType.
test case added, in xsdtests, extra020
Fixed in 9.1.0.6