SH::MetaFields Node1 SH::MetaFields + gridName + gridFilter + sourceSample + treeName_default + crossSectionRelUncertainty + lumi + isData Node2 std::string Node2->Node1 +sampleName +cacheSize +treeName +crossSection +filterEfficiency +numEvents +gridSourceOptions +gridFilter_default +numEventsPerFile +kfactor ... Node3 std::basic_string< char > Node3->Node2