question: StringVector processPREFIX_LIST ( StylesheetHandler handler , String uri , String name , String rawName , String value ) throws org . xml . sax . SAXException { StringTokenizer tokenizer = new StringTokenizer ( value , " \t\n\r\f" ) ; int nStrings = tokenizer . countTokens ( ) ; StringVector strings = new StringVector ( nStrings ) ; for ( int i = 0 ; i < nStrings ; i ++ ) { String prefix = tokenizer . nextToken ( ) ; String url = handler . getNamespaceForPrefix ( prefix ) ; if ( prefix . equals ( Constants . ATTRVAL_DEFAULT_PREFIX ) || url != null ) strings . addElement ( prefix ) ; else throw new org . xml . sax . SAXException ( XSLMessages . createMessage ( XSLTErrorResources . ER_CANT_RESOLVE_NSPREFIX , new Object [ ] { prefix } ) ) ; } return strings ; }
target:  Process an attribute string of type T_PREFIXLIST into a vector of prefixes that may be resolved to URLs.