{
"nodes": {
"node1": {
"op": "foo",
"children": [
"node2",
"node3"
],
"eclass": "18"
},
"node2": {
"op": "bar",
"eclass": "12"
},
"node3": {
"op": "baz",
"children": [],
"eclass": "12",
"cost": 6.0
}
},
"class_data": {
"18": {
"type": "foobar"
},
"12": {
"labels": "baz, bar",
"other thing": "another label"
}
}
}