columnar::TruthParticleDef Node1 columnar::TruthParticleDef + idName   Node2 columnar::RegularContainer Id< xAOD::TruthParticle, xAOD::TruthParticleContainer > + isContainerId + regularObjectId + variantObjectId + regularColumnAccessorArray + isMutable + perEventRange + perEventId   Node2->Node1