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Test matches-50 is a conversion of a regular expression test suite originally designed for Perl. It contains many individual tests. Within this, tests p888, 889, 890, 891 use the construct "[\d-X]" (with different values of X). In XSD 1.0 this is an error. In XSD 1.1 it is allowed (the construct is not treated as a range, instead the "-" is treated as matching a hyphen).
I've implemented the least-effort solution which is to add a dependency on XSD 1.0 for the entire test.