6 links
Commerce XML
cxml.org
Formats for common business transactions with DTDs, manual, samples, and user guide.
newtelligence
newtelligence.com
Developer resources for the XML-based SOAP protocol and COM(+) development.
SoapRPC.com
soaprpc.com
Developer resource center about the SOAP protocol, existing software and standards.
XML Europe Conference and Exposition
xmleurope.com
XML Europe is the most definitive, international event on XML and related technologies
ZapThink XML Standards Report
zapthink.com
The most up-to-date, authoritative, exhaustive report of all 350+ XML Standards that have shaped the industry to date.