ajv/spec/remotes/tree.json

{
  "$id": "http://localhost:1234/tree.json",
  "description": "tree of nodes",
  "type": "object",
  "properties": {
    "meta": { "type": "string" },
    "nodes": {
      "type": "array",
      "items": { "$ref": "node.json"}
    }
  },
  "required": ["meta", "nodes"]
}