//! RELAX NG `datatypeLibrary` support: the mandatory built-in library
//! (`""`, `string`/`token`, §5.2), the XSD library (all primitive and
//! derived W3C XML Schema datatypes and facets, per the "Guidelines for
//! using W3C XML Schema Datatypes with RELAX NG"), and the
//! [`registry::DatatypeLibrary`] plugin trait a caller uses to add its own
//! non-standard library (e.g. vnu's `http://whattf.org/datatype-draft`,
//! which this crate deliberately does not implement — see
//! `plan/DECISIONS.md`).
pub use XSD_DATATYPE_LIBRARY;
pub use ;