4 @& i) D2 e+ Z( f, l0 @% [0 Z) A 2 n$ N0 |# t* l* fopen references - references which cannot be resolved because their target object is currently not available ( @% g9 }7 M! ?8 j; M * [/ R+ D( S6 e! p6 e 1 W/ Q8 g% B/ w4 ~ g* smodified - object to right has been modified since last save to database