Up-to-date Specifications of XML

Original Specification (W3C Recommendation) XML 1.0 at W3C: http://www.w3.org/XML/

5th Edition (corrections, updates, no major changes At Extensible Markup Language (XML) 1.0 (Fifth Edition)

commented version at XML.COM (Annotated XML): http://www.xml.com/pub/a/axml/axmlintro.html

XML 1.1 (Second Edition) - changes induced by the introduction of UNICODE 3 , easier            normalization , the specification of handling procedure for "end of line" characters . XML 1.1 is not bound to specific version of UNICODE, but always on the latest version.