question: private boolean isSame ( final Relation a , final Relation b ) { boolean sameSourceTarget = false ; if ( isSame ( a . getSource ( ) , b . getSource ( ) ) && isSame ( a . getTarget ( ) , b . getTarget ( ) ) ) { sameSourceTarget = true ; } else if ( symmetric && isSame ( a . getSource ( ) , b . getTarget ( ) ) && isSame ( a . getTarget ( ) , b . getSource ( ) ) ) { sameSourceTarget = true ; } return sameSourceTarget && isSame ( a . getRelationshipType ( ) , b . getRelationshipType ( ) ) && isSame ( a . getRelationSubType ( ) , b . getRelationSubType ( ) ) ; }
target:  Checks if relations are the same.