test
node1
BFO:0000003
occurrent
node1->node1
node2
BFO:0000015
process
node1->node2
node5
PO:0009012
plant structure
development stage
node2->node5
node3
PO:0025337
life of whole plant
stage
node4
PO:0028003
gametophyte
development stage
node3->node4
node7
PO:0007033
whole plant
development stage
node5->node7
node6
BFO:0000001
entity
node6->node1
node7->node3
node7->node4