The XML Bible
Elliotte Rusty Harold
IDG Books, 1999
ISBN: 0-7645-3236-7
This presentation: http://metalab.unc.edu/xml/slides/xmlsig0899/
XPointers: http://metalab.unc.edu/xml/books/bible/updates/17.html
XLinks: http://metalab.unc.edu/xml/books/bible/updates/16.html
XPath Specification: http://www.w3.org/TR/xpath
XPointer Specification: http://www.w3.org/TR/WD-xptr
XLink Specification: http://www.w3.org/TR/xlink