XQuery 1.0 implementation
A new configuration option has been added for XQuery processing:
XQUERY_MULTIPLE_MODULE_IMPORTS. The option is false by default,
and should be set to true to retain the behaviour of previous releases. If the option is false,
then when an import module
declaration is encountered for a particular module namespace URI,
and there is already a loaded module for that namespace, then the existing module is used without checking
whether the module location URI matches. If the option is true, then the existing module is used only
if the location URI matches.