The following list is recommended XML reading.

See generally, the World Wide Web Consortium's Website. Other sites of interest are Robin Cover's SGML/XML Website, OASIS, and XML.com.

XML 1.0

http://www.w3.org/XML/

http://www.w3.org/TR/1998/REC-xml-19980210

XML Stylesheets

CSS

http://www.w3.org/Style/CSS/

http://www.w3.org/TR/REC-CSS1

http://www.w3.org/TR/REC-CSS2/

XSL

http://www.w3.org/Style/XSL/

http://www.w3.org/TR/WD-xsl/

XSL Transformations (XSLT)

XML Path Language (XPath)

XML Namespaces

http://www.w3.org/TR/1999/REC-xml-names-19990114/

XLink

http://www.w3.org/TR/WD-xml-link

XPointer

http://www.w3.org/TR/WD-xptr

XML-Signatures

http://www.w3.org/Signature/

Resource Description Framework (RDF)

http://www.w3.org/RDF/

http://www.w3.org/TR/PR-rdf-schema/

XML Schema

http://www.w3.org/XML/Activity#schema-wg

http://www.w3.org/TR/NOTE-xml-schema-req

http://www.w3.org/TR/xmlschema-1/

http://www.w3.org/TR/xmlschema-2/

Document Object Model

http://www.w3.org/DOM/

http://www.w3.org/TR/REC-DOM-Level-1/

XForms

http://www.w3.org/MarkUp/Forms/

See also:

XFDL (http://www.uwi.com/):
http://www.w3.org/TR/1998/NOTE-XFDL-19980902

W3C staff comment on XFDL:
http://www.w3.org/Submission/1998/16/Comment

Jet Forms Alternative (http://www.jetform.com/):
http://www.w3.org/Submission/1999/05/

W3C staff comment on Jet Forms Alternative:
http://www.w3.org/Submission/1999/05/Comment