A resolver to get the database.dtd file for the XML parser from the jar.
This does not work with jdk1.3 on linux and OSX, see
Bug 4337703 author: Martin Poeschl author: Henning P. Schmiedehausen author: Quinton McCombs version: $Id: DTDResolver.java 542370 2007-05-29 01:26:13Z seade $