This is probably a j2sdk1.4.0-BETA3 problem.
I've seen quite a few other problems with it, but
not this ant one.
Only thing I can think of, is that 1.4 comes with
JAXP already configured.
Thank you. I'm up and running now. FYI, it wasn't the JDK 1.4 beta that was the problem. While reinstalling everything on a computer with JDK 1.3, I noticed that I couldn't reuse and existing copy of the JBoss_documentation-example.zip file. I must have messed with this file before, and contaminated it. Anyway, when I downloaded a fresh JBoss_documentation-example.zip file, the install worked under both JDK 1.3 and JDK 1.4 beta.