úÎ ¸Æ  EThis is a global synchronisation variable used to guard calls to the L Pathfinder C library. The C library appears not to be thread safe and this M variable is used to make sure that only one pathfinder call is made at time C even in the presence of parallel or concurrent program execution. (Relational optimiser and code generator *A table algebra plan bundle in XML format FAn optimisation string (empty string indicates default optimisations) Output format         Pathfinder-0.5.9Database.Pathfinder OptString OutputString ErrorString XmlString OutputFormat OutputDot OutputXml OutputSql pathfinder COutputFormatunCOutputFormatc_PFcompile_ferry_opt globalMVarc_PFoutput_format_sqlc_PFoutput_format_xmlc_PFoutput_format_dotoutputFormatToCInt