test
node1
BFO:0000003
occurrent
node1->node1
node5
BFO:0000015
process
node1->node5
node2
BFO:0000001
entity
node2->node1
node3
GO:0008150
biological_process
node4
GO:0032501
multicellular
organismal process
node3->node4
node6
GO:0007586
digestion
node4->node6
node5->node3
node7
GO:0044245
polysaccharide
digestion
node6->node7