public static bool MulipleOfTypeAllowed(this ICollectableTypeTemplate i)
 {
     return(i.PossibleRange == CollectionRange.ZeroToMany ||
            i.PossibleRange == CollectionRange.OneToMany);
 }
 public static bool MustHaveAtleastOneItem(this ICollectableTypeTemplate i)
 {
     return(i.PossibleRange == CollectionRange.One ||
            i.PossibleRange == CollectionRange.OneToMany);
 }