Map<String, String> nsMap = new HashMap<String, String>();
nsMap.put("oai_dc", "http://www.openarchives.org/OAI/2.0/oai_dc/");
nsMap.put("dc", "http://purl.org/dc/elements/1.1/");
nsMap.put("foxml", "info:fedora/fedora-system:def/foxml#");
NamespaceContext ctx = new SimpleNamespaceContext(nsMap);
XMLUnit.setXpathNamespaceContext(ctx);
// not really necessary, but will cope with any junk left from other tests
purgeDemoObjects(s_client);