XML Sites

BizTalk

Microsoft's XML framework (schema + messaging)

Cafe con Leche

Forum for current XML news and resources

CSS School

From W3Schools

DHTML School

From W3Schools

DOM School

From W3Schools

DTD School

From W3Schools

eCo

XML framework from CommerceNet

FinXML

Financial XML for Capital Markets data interchange

FIX Financial Information Exchange Protocol

FpML

XML-based financial derivatives interchange

GoXML Advanced XML search engine 

IBM Alphaworks

IBM's 'alpha' technology site (strong XML)

IBM developerWorks

IBM's XML Developer forum

ICE

XML-based content syndication

JavaScript School

From W3Schools

MSDN XML

Microsoft's XML Developer Forum

MSDN XML Guide

Online XML Developer's Guide and Reference (3.0)

Oracle XML

Oracle's XML TechNet Forum

RosettaNet

XML-based supply chain management

Schema School

From W3Schools

SOAP

All about SOAP messaging protocol

VBScript School

From W3Schools

W3C Annotated XML

Tim Bray's annotated version of XML Specification

xCBL

Commerce One's XML Common Business Library

XML Applications

Hyperlinked list of XML apps

XML.com

Comprehensive XML resource site

XML.org

Leading standards forum (OASIS-run)

XMLNews

XML-based content syndication

XML Glossary

Online hyperlinked glossary from Microsoft's MSDN

XML School

From W3Schools

XML Software

Master site for all categories of XML tools

XSLT-Servlet Demo

DB2XML Demo against Northwind DB