2001-02-22: Thomas Wason initial creation In namespace-aware XML processors, the "xml" prefix is bound to the namespace name http://www.w3.org/XML/1998/namespace. Do not reference this file in XML instances Schawn Thropp: Changed the uriReference type to string type 2001-07-26: S Thropp: Changed the XSD namespace to point to Schema of schemas for the 5/2/2001 W3C Recommendation Changed the XSD types for base and link to xsd:anyURI Refers to universal XML 1.0 lang attribute Refers to XML Base: http://www.w3.org/TR/xmlbase