Perl module for resolving public and remapping system identifiers

 XML::Catalog implements draft 0.4 of John Cowan's XML Catalog (formerly
 known as XCatalog) proposal Catalogs may be written in either SOCAT or
 XML syntax; XML::Catalog will assume SOCAT syntax if the catalog is not
 in well-formed XML syntax.
 .
 This module, as of 1.0.0, also supports Oasis XML catalogs.