{
  "id": "demo001",
  "title": "Deutsch-Englisch Demo Pfad",
  "description": "Ein kurzer Demo-Pfad mit verschiedenen Exercise-Typen",
  "metadata": [
    {
      "path_id": "demo001",
      "version": "1.0.0",
      "created_at": "2024-01-20T10:00:00Z",
      "updated_at": "2024-01-20T10:00:00Z"
    }
  ],
  "nodes": [
    {
      "id": 1,
      "title": "Grundvokabeln",
      "description": "Einfache Wörter lernen",
      "path_id": "demo001",
      "exercises": [
        {
          "id": 1,
          "ex_type": "vocabulary",
          "content": "{\"word\": \"apple\", \"translation\": \"Apfel\", \"image\": \"apple.jpg\"}",
          "node_id": 1
        },
        {
          "id": 2,
          "ex_type": "multiple_choice",
          "content": "{\"question\": \"Was bedeutet 'book'?\", \"options\": [\"Buch\", \"Stuhl\", \"Tisch\", \"Fenster\"], \"correct\": 0}",
          "node_id": 1
        }
      ]
    },
    {
      "id": 2,
      "title": "Sätze",
      "description": "Einfache Sätze verstehen",
      "path_id": "demo001",
      "exercises": [
        {
          "id": 3,
          "ex_type": "translation",
          "content": "{\"source\": \"I am happy\", \"target\": \"Ich bin glücklich\", \"language_pair\": \"en-de\"}",
          "node_id": 2
        },
        {
          "id": 4,
          "ex_type": "fill_blank",
          "content": "{\"sentence\": \"The cat ___ on the table\", \"answer\": \"is\", \"hint\": \"Verb 'to be' in 3rd person singular\"}",
          "node_id": 2
        }
      ]
    }
  ]
}