ONLamp.com: PHP-XML Mailing List
   Creation of this list inspired by a passing mention of the dearth of tools for and lack of discussion of PHP and XML despite the incredible popularity of each technology individually
   http://www.onlamp.com/pub/a/php/php-xml-ml.html

XML Apache mailing lists
   Home of the xml.apache.org Announcement and General Discussion Lists, Xerces-J User and Developer Lists, Xerces-C Developer List, Xerces-P Developer List, Xalan Developer List, FOP Developer List, Zang Developer List, SOAP User and Developer Lists, and Ba
   http://xml.apache.org/mail.html

ietf-xml-mime
   Mailing list for discussing MIME types for XML.
   http://www.imc.org/ietf-xml-mime/index.html