I think I may have found an error in the code package. The zXml.
js file used in "/Ch04/XSLT/Best Picks Revisited" is 5359 bytes in size, while the zXml file used in other examples is 6597 bytes and much more recent. The example only worked after I replaced the older file with one of the new ones used in the other examples.
Great book though!
Laurens