Hi @all ! Since a few weeks I've a problem I could not solve on my own. I hope someone here can help me. I haven't found something equal in the castor documentation. I want to unmarshall a specific *.xml file with a mapping file in java with castor, but i get no correct unmarshalled object its always null. But I could isolate the problem. I think its a problem of xmlns and xmlns:xsi in the root element of the *.xml file. XML file looks like this: ISKV21c_Kern_Basics 1569b7bf3ee84fb4b60d43731bb0493a false true de_DE en_US de_DE My mapping file looks like this: Guidancer V5.0.01007 Mapping File The project object is always null when I don't change the XML file. If I delete xmlns="http://www.eclipse.org/jubula/client/archive/schema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" then my project object is unmarshalled correctly. Is there any way to map correct to my XML file without deleting the attributes of the root element? How can I change my mapping file to map correct? Has anyone had the same problem? My used Jars are: castor-1.3.1-commons.jar castor-1.3.1-core.jar castor-1.3.1-xml.jar castor-1.3.1-xml-schema.jar Thanks in advance! greetings Patrick Möller