* @see eu.planets_project.ifr.core.storage.api.DigitalObjectManager#retrieve(java.net.URI)
*/
public DigitalObject retrieve(URI pdURI) throws DigitalObjectNotFoundException {
OaiPmhServer server = new OaiPmhServer(baseURL);
try {
Record rec = server.getRecord(pdURI.toString(), metaDataPrefix);
Element recEle = rec.getMetadata();
if (recEle != null) {
Document doc = recEle.getDocument();
HashMap<String, String> map = new HashMap<String, String>();
map.put("pmh", "http://www.openarchives.org/OAI/2.0/");