columnar::TrackDef Node1 columnar::TrackDef + idName   Node3 columnar::Track1Def + idName   Node1->Node3 Node4 columnar::Track2Def + idName   Node1->Node4 Node5 columnar::Track3Def + idName   Node1->Node5 Node2 columnar::RegularContainer Id< xAOD::TrackParticle, xAOD::TrackParticleContainer > + isContainerId + regularObjectId + variantObjectId + regularColumnAccessorArray + isMutable + perEventRange + perEventId   Node2->Node1