void AccumulateValue ( [PCGMetadataEntryKey](API\Plugins\PCG\Metadata\PCGMetadataEntryKey) ItemKey, const [FPCGMetadataAttributeBase](API\Plugins\PCG\Metadata\FPCGMetadataAttributeBase) * InAttributeA, [PCGMetadataEntryKey](API\Plugins\PCG\Metadata\PCGMetadataEntryKey) InEntryKeyA, float Weight )