Ok, so, the schematron validates. So back to your question Validating XML file with XML::Schematron::LibXSLT, with the new_with_traits not printing anything (no $messages),

when verify returns no $messages it probably means file is valid according to schema

Does that make sense? Do you have a file you know to be bad against your schema and a file you know to be good against your schema to test against your schema?