{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://example.com/schemas/lookup-user",
  "$ref": "#/$defs/LookupUser",
  "$defs": {
    "LookupUser": {
      "properties": {
        "name": {
          "$ref": "https://example.com/schemas/lookup-name"
        },
        "alias": {
          "type": "string"
        }
      },
      "additionalProperties": false,
      "type": "object",
      "required": [
        "name"
      ]
    }
  }
}