With the increased use of XML, there are increasingly normative references to XML 'documents' which include such as "May 2001, <http://www.w3.org/TR/xmlschema-1/>. " as in eg RFC3470, RFC3688, RFC3735. Trouble is, that form of URI picks the latest Edition, which is currently October 2004. To stay with the May 2001 Edition, the URI should be <http://www.w3.org/TR/2001/xmlschema-1-20010502/>. which then does not include the errata or minor improvements. What is best practice when referring to these XML 'documents'? Tom Petch _______________________________________________ Ietf@xxxxxxxx https://www1.ietf.org/mailman/listinfo/ietf