nsIRDFXMLSerializer Interface

 Add the specified namespace to the serializer.
 @param aPrefix the attribute namespace prefix
 @param aURI the namespace URI

void addNameSpace(in nsIAtom aPrefix, in DOMString aURI)

 Initialize the serializer with the specified datasource.
 @param aDataSource the datasource from which data will be
   serialized

void init(in nsIRDFDataSource aDataSource)