{
  "$schema": "https://nuncaeslupus.github.io/drawspec/schema/drawspec-v1.schema.json",
  "version": 1,
  "kind": "flow",
  "title": "Rabbits and foxes",
  "description": "Course notes in ecology: rabbits breed, foxes eat rabbits after a delay, and foxes die off; three loops, their types derived from the signs.",
  "nodes": [
    {"id": "rabbits", "text": "Rabbits"},
    {"id": "births", "text": "Rabbit births"},
    {"id": "foxes", "text": "Foxes"},
    {"id": "deaths", "text": "Fox deaths"}
  ],
  "edges": [
    {"from": "rabbits", "to": "births", "polarity": "+"},
    {"from": "births", "to": "rabbits", "polarity": "+"},
    {"from": "rabbits", "to": "foxes", "polarity": "+", "delay": true},
    {"from": "foxes", "to": "rabbits", "polarity": "-"},
    {"from": "foxes", "to": "deaths", "polarity": "+"},
    {"from": "deaths", "to": "foxes", "polarity": "-"}
  ],
  "loops": [
    {"text": "Breeding", "nodes": ["rabbits", "births"]},
    {"text": "Predation", "nodes": ["rabbits", "foxes"]},
    {"text": "Fox mortality", "nodes": ["foxes", "deaths"]}
  ]
}