@class NSMutableArray, KGMutableElementIdentifierSet; @interface KGMutablePropertyValueArray : KGPropertyValueArray @property (readonly, nonatomic) NSMutableArray *values; @property (readonly, nonatomic) KGMutableElementIdentifierSet *elementIdentifiers; - (id)init; - (void)appendValue:(id)a0 forIdentifier:(unsigned long long)a1; @end