{
  "title": "示例采购项目要求清单",
  "sources": [{"id": "S1", "name": "示例采购文件（虚构，不用于报价）"}],
  "requirements": [
    {"id": "T1", "source_id": "S1", "locator": "技术第1条", "critical": false, "must_keep": ["库存≥43英寸", "监控≥65英寸"]},
    {"id": "T2", "source_id": "S1", "locator": "技术第2条★", "critical": true, "must_keep": ["软件对接承诺书"]},
    {"id": "B1", "source_id": "S1", "locator": "商务第1条★", "critical": true, "must_keep": ["60个日历天", "签约起算"]}
  ],
  "procurement": [
    {"category": "大屏", "item": "库存屏 / 监控屏", "summary": "库存≥43英寸；监控≥65英寸", "action": "两类设备提供软件对接承诺书", "refs": ["T1", "T2"]}
  ],
  "commercial": [
    {"topic": "交付", "agreement": "交货并安装调试完成", "numbers": "60个日历天", "action": "★签约起算；地点按采购文件", "refs": ["B1"]}
  ]
}