ContributionDescriptor cd = new ContributionDescriptor();
cd.setConfigurationId("Fred");
cd.setConditionalExpression("and class foo");
cd.setLocation(location);
cd.addElement(newElement("bar"));
md.addContribution(cd);
XmlModuleDescriptorProcessor processor = new XmlModuleDescriptorProcessor(definition, eh);
processor.processModuleDescriptor(md);