{
  "type": "object",
  "properties": {
    "actions": {
      "type": "array",
      "items": {
        "type": "object",
        "properties": {
          "source_id": {"type": "string", "minLength": 1},
          "task": {"type": "string", "minLength": 1},
          "owner": {"type": ["string", "null"], "minLength": 1},
          "due": {"type": ["string", "null"], "minLength": 1}
        },
        "required": ["source_id", "task", "owner", "due"],
        "additionalProperties": false
      }
    }
  },
  "required": ["actions"],
  "additionalProperties": false
}