( mbool 
   (
      (
         ( "begin of time"  "2003-11-20-06:03"  TRUE  FALSE ) TRUE )
      (
         ( "2003-11-20-06:03"  "2003-11-20-06:43"  TRUE  FALSE ) FALSE )
      (
         ( "2003-11-20-06:43"  "end of time"  TRUE  TRUE ) TRUE )))