test
node1
BFO:0000003
occurrent
node1->node1
node4
BFO:0000015
process
node1->node4
node2
PO:0025338
collective plant
organ structure
development stage
node3
PO:0025527
shoot system
development stage
node2->node3
node7
PO:0025532
bud burst stage
node3->node7
node6
PO:0009012
plant structure
development stage
node4->node6
node5
BFO:0000001
entity
node5->node1
node6->node2