graph = ({
"id": "root",
"layoutOptions": {
"elk.algorithm": "layered"
},
"children": [
{"id": "n1", "width": 30, "height": 30},
{"id": "n2", "width": 30, "height": 30},
{"id": "n3", "width": 30, "height": 30}
],
"edges": [
{"id": "e1", "sources": ["n1"], "targets": ["n2"]},
{"id": "e2", "sources": ["n1"], "targets": ["n3"]}
]
})