question: @ SuppressWarnings ( "unused" ) private String checkForWellKnownNamespacePrefix ( final String prefix ) { final String namespace ; if ( prefix . equals ( "bd" ) ) { prefixMap . put ( "bd" , namespace = BD . NAMESPACE ) ; } else if ( prefix . equals ( "bds" ) ) { prefixMap . put ( "bds" , namespace = BDS . NAMESPACE ) ; } else if ( prefix . equals ( "hint" ) ) { prefixMap . put ( "hint" , namespace = QueryHints . NAMESPACE ) ; } else if ( prefix . equals ( "rdf" ) ) { prefixMap . put ( "rdf" , namespace = RDF . NAMESPACE ) ; } else if ( prefix . equals ( "rdfs" ) ) { prefixMap . put ( "rdfs" , namespace = RDFS . NAMESPACE ) ; } else if ( prefix . equals ( "xsd" ) ) { prefixMap . put ( "xsd" , namespace = XSD . NAMESPACE ) ; } else if ( prefix . equals ( "foaf" ) ) { prefixMap . put ( "foaf" , namespace = FOAFVocabularyDecl . NAMESPACE ) ; } else if ( prefix . equals ( "fn" ) ) { prefixMap . put ( "fn" , namespace = FN . NAMESPACE ) ; } else if ( prefix . equals ( "owl" ) ) { prefixMap . put ( "owl" , namespace = OWL . NAMESPACE ) ; } else if ( prefix . equals ( "sesame" ) ) { prefixMap . put ( "sesame" , namespace = SESAME . NAMESPACE ) ; } else if ( prefix . equals ( "gas" ) ) { prefixMap . put ( "gas" , namespace = GASService . Options . NAMESPACE ) ; } else { namespace = null ; } return namespace ; }
target:  Provide silent declaration for some well known namspaces.