question: public boolean functionAvailable ( String ns , String funcName ) throws javax . xml . transform . TransformerException { boolean isAvailable = false ; if ( null != ns ) { ExtensionHandler extNS = ( ExtensionHandler ) m_extensionFunctionNamespaces . get ( ns ) ; if ( extNS != null ) isAvailable = extNS . isFunctionAvailable ( funcName ) ; } return isAvailable ; }
target:  Execute the function-available() function.