nsIRDFXMLParser Interface

 Create a stream listener that can be used to asynchronously
 parse RDF/XML.
 @param aSink the RDF datasource the will receive the data
 @param aBaseURI the base URI used to resolve relative
   references in the RDF/XML
 @return an nsIStreamListener object to handle the data

nsIStreamListener parseAsync(in nsIRDFDataSource aSink, in nsIURI aBaseURI)

 Parse a string of RDF/XML
 @param aSink the RDF datasource that will receive the data
 @param aBaseURI the base URI used to resolve relative
   references in the RDF/XML
 @param aSource a UTF8 string containing RDF/XML data.

void parseString(in nsIRDFDataSource aSink, in nsIURI aBaseURI, in AUTF8String aSource)