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validateexpr-24 contains declare namespace lu = 'http://www.w3.org/XQueryTest/ListUnionTypes' ; but then it tries to load the schema import schema "http://www.w3.org/ListUnionTypes"; that is not defined in the catalog; the correct namespace is http://www.w3.org/XQueryTest/ListUnionTypes
This problem has been fixed in the way that you've suggested. Please verify this fix and close the bug if you agree with this resoution.