XML FAQ
Intro 1,
Intro 2,
Intro 3, more
intros
IBM Tutorials
What's new in TAG land?
Intro to newer XML-related features (namespaces, XSLT, DOM etc)
XML 1.0 specs
(annotated version)
XML launch pad
Canonical XML,
XML parser tests
Web-based XML validation
(another one)
XML from W3C and
other references and standards
Books, Tutorials, Info
XML browsers:
MS IE 5.0 (Windows, Solaris)
XML parsers:
libxml (C),
Aelfred and
XP (in Java),
expat
(parser toolkit in C),
XML4C (in C++).
Also see C and Java codes available IBM and from Oracle.
Perl & XML
More free XML software
XML resources and
tools
SGML/XML resources
More XML resources from xml.org