question: private Document parse ( final String data , DocumentBuilder docBuilder ) { if ( docBuilder == null || data == null ) { return null ; } Document document = null ; try { StringBuilder buf = new StringBuilder ( 1024 ) ; if ( ! data . startsWith ( "<?xml" ) ) { buf . append ( BEGIN_PART ) ; } buf . append ( data ) ; if ( ! data . endsWith ( END_PART ) ) { buf . append ( END_PART ) ; } InputSource inputSource = new InputSource ( new StringReader ( buf . toString ( ) ) ) ; document = docBuilder . parse ( inputSource ) ; } catch ( Exception e ) { LOGGER . warn ( "Problem with creating document: " + e . getMessage ( ) ) ; } return document ; }
target:  Converts the LoggingEvent data in XML string format into an actual XML Document class instance.