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+This module implements draft 0.4 of John Cowan's XML Catalog (formerly
+known as XCatalog) proposal (<http://www.ccil.org/~cowan/XML/XCatalog.html>).
+Catalogs may be written in either SOCAT or XML syntax (see the proposal
+for syntax details); XML::Catalog will assume SOCAT syntax if the catalog
+is not in well-formed XML syntax.