type constraints based on a subset of XML schema datatypes

 Types::XSD::Lite provides all the type constraints from XML Schema
 that could be implemented without introducing
 extra runtime dependencies (above Type::Tiny).
 That's basically all of the XSD types,
 except datetime-related ones,
 and XML-specific ones (QNames, IDRefs, etc).
 .
 If you want the full set of XML Schema types, see Types::XSD.