Castor unmarshalling and encoding

Usually I would post this at the Castor - forums, but they do not exist anymore. I always found Mailing lists suspect and cumbersome, so instead I will give it a shot here:
My goal is to read an xml file with the proper encoding as defined in the XML PI, using castor. The org.jdom.input.SAXBuilder uses the Encoding defined in the PI to read the XML file with the proper encoding. The Unmarshaller in Castor does not.
The Unmarshaller methods use 3 different XML sources, either java.io.Reader, org.xml.sax.InputSource or org.w3c.dom.Node. When using a Reader I must know beforehand what Encoding it should use. I thought of using a pre-parser which reads the PI before creating a Reader with the proper encoding. Does this sound like a fair solution, or have I missed something? Is there already any existing tools/libraries/classes which can read the PI of an XML file without much overhead?

Ehem.. perhaps I should try InputSource before discarding it as useless. The problem solved itself :-)

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