typeSystem = aCAS.getTypeSystem();
XMLSerializer xmlSer = new XMLSerializer(stream, false);
if (encoding != null)
xmlSer.setOutputProperty(OutputKeys.ENCODING, encoding);
XCASSerializer ser = new XCASSerializer(typeSystem);
ser.serialize(aCAS, xmlSer.getContentHandler(), false, otsd);
}
/**
* Serializes CAS into a given OutputStream
*