question: private static void ensureDocumentBuilder ( ) throws DSSException { if ( dbFactory != null ) { return ; } dbFactory = DocumentBuilderFactory . newInstance ( ) ; dbFactory . setNamespaceAware ( true ) ; try { dbFactory . setFeature ( "http://xml.org/sax/features/external-general-entities" , false ) ; dbFactory . setFeature ( "http://xml.org/sax/features/external-parameter-entities" , false ) ; dbFactory . setXIncludeAware ( false ) ; dbFactory . setExpandEntityReferences ( false ) ; } catch ( ParserConfigurationException e ) { throw new DSSException ( e ) ; } }
target:  Guarantees that the xmlString builder has been created.