question: protected void printDocType ( Writer out , DocType docType ) throws IOException { String publicID = docType . getPublicID ( ) ; String systemID = docType . getSystemID ( ) ; String internalSubset = docType . getInternalSubset ( ) ; boolean hasPublic = false ; out . write ( "<!DOCTYPE " ) ; out . write ( docType . getElementName ( ) ) ; if ( publicID != null ) { out . write ( " PUBLIC \"" ) ; out . write ( publicID ) ; out . write ( "\"" ) ; hasPublic = true ; } if ( systemID != null ) { if ( ! hasPublic ) { out . write ( " SYSTEM" ) ; } out . write ( " \"" ) ; out . write ( systemID ) ; out . write ( "\"" ) ; } if ( ( internalSubset != null ) && ( ! internalSubset . equals ( "" ) ) ) { out . write ( " [" ) ; out . write ( lineSeparator ) ; out . write ( docType . getInternalSubset ( ) ) ; out . write ( "]" ) ; } out . write ( ">" ) ; }
target:  This handle printing the DOCTYPE declaration if one exists.