Dan Vint has produced an interactive reference to the EBNF productions from XML specifications.

The reference documents several XML specifications, including XML 1.0, Namespaces, XPath, XSLT, and XPointer. Via a file/folder-like interface, the user can locate productions from the specifications, which are extensively hyperlinked.

Also included are descriptions of each symbol and validation constraints. In a message to XML-DEV, the author requested feedback and suggestions for the site.