This is a valuable 239 page reference detailing all the interfaces deemed by W3C to be basic to any implementation of the DOM (including HTML), as well as XML-specific interfaces and Microsoft's own, further extensions to the Document Object Model. Each object is fully described with working examples that clearly illustrate how its properties and methods (and in the case of Microsoft's extension, event handlers) can be used to manipulate actual XML documents.
XMLDOM Quick Reference Guide 