The recommended DTD files for XHTML are missing at W3C. The present message contains an examination of the case and suggests a workaround. _____
Diagnosis: For the SYSTEM <http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd> identifier for XHTML 1.0 Transitional as recommended by Strictly Conforming Documents <http://www.w3.org/TR/xhtml1/#normative> the server reply is Service Unavailable Content-Location: msie7.asis <http://www.w3.org/TR/xhtml1/DTD/msie7.asis> Vary: negotiate, User-Agent And when you try the content location explicitly, you get Not Found Therefore, XHTML documents with the recommended DOCTYPE do not validate as XML. This misconfiguration is a severe bug and it may cause major disruption to XML applications worldwide. Workaround: 1. the links in Document <http://www.w3.org/TR/2002/REC-xhtml1-20020801/Overview.html#dtds> Type Definitions work, 2. you are free to use any <http://www.w3.org/TR/html/DTD/xhtml1-strict.dtd> SYSTEM identifier that works, although it is not recommended. Note that all DTDs refer to the invalid location in the usage section. BTW: Why are the DTDs served as text/plain? They should be served as application/sgml and application/xml-dtd, as applicable! _____ HTH, Chris
