{
  "generated": "2026-09-07",
  "sources": [
    {
      "source_id": "eu-2024-2754",
      "publisher": "European Commission",
      "source_type": "regulation",
      "url": "https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=OJ:L_202402754",
      "tier": 1,
      "used_for": "countervailing duties (BEV from China)"
    },
    {
      "source_id": "eu-taric",
      "publisher": "European Commission TARIC",
      "source_type": "customs tariff",
      "tier": 1,
      "used_for": "standard import duty (MFN)"
    },
    {
      "source_id": "national-tax",
      "publisher": "National tax authorities",
      "source_type": "tax",
      "tier": 1,
      "used_for": "VAT/GST rates"
    },
    {
      "source_id": "manufacturer",
      "publisher": "Manufacturer datasheets / official sites",
      "source_type": "spec",
      "tier": 2,
      "used_for": "vehicle specs (range/battery/motor)"
    },
    {
      "source_id": "cnevpost-carnewschina",
      "publisher": "CnEVPost / CarNewsChina",
      "source_type": "industry media",
      "tier": 3,
      "used_for": "vehicle range/battery/pricing"
    },
    {
      "source_id": "autohome-dcd",
      "publisher": "汽车之家 Autohome / 懂车帝",
      "source_type": "catalog",
      "tier": 3,
      "used_for": "vehicle specs"
    },
    {
      "source_id": "wikipedia",
      "publisher": "Wikipedia (EN/ZH)",
      "source_type": "tertiary",
      "tier": 4,
      "used_for": "cross-check (not primary reference)"
    },
    {
      "source_id": "wto-tariff",
      "publisher": "WTO Tariff Download Facility / national customs",
      "source_type": "customs tariff",
      "tier": 1,
      "used_for": "import duty (MFN) for non-EU markets"
    }
  ],
  "_conventions": {
    "schema_version": 1,
    "adopted": "2026-09-24",
    "purpose": "逐字段数据溯源字段约定（任务书 §7）。先落约定，不批量改造 517 个车型文件；批量迁移留后续决策。",
    "vehicle_frontmatter_fields": {
      "data_source": {
        "type": "string",
        "required": false,
        "desc": "车辆级数据来源描述（可引用 source_id 列表或自由文本）"
      },
      "data_updated": {
        "type": "string (YYYY-MM-DD)",
        "required": false,
        "desc": "数据最后更新/核验日期"
      },
      "data_reviewed": {
        "type": "boolean",
        "required": false,
        "desc": "是否经过人工复核"
      },
      "data_tier": {
        "type": "integer 1-4",
        "required": false,
        "desc": "数据置信层级（1=官方一手，4=三级交叉核对）"
      },
      "confidence": {
        "type": "enum",
        "required": false,
        "enum": [
          "high",
          "medium",
          "low"
        ],
        "desc": "车辆级数据整体置信度；缺失时由渲染层按来源组合推导（当前默认 medium）"
      },
      "field_sources": {
        "type": "object (可选，后续批次启用)",
        "required": false,
        "desc": "逐字段溯源：{字段名: {source_id, source_type, confidence, verified_date}}"
      }
    },
    "source_type_enum": [
      "manufacturer",
      "government",
      "regulation",
      "customs",
      "industry",
      "primary",
      "secondary",
      "evhub_calculation",
      "evhub_estimate"
    ],
    "source_type_enum_notes": {
      "manufacturer": "厂商官网/规格书（官方一手）",
      "government": "政府机构发布（含税务/海关/统计）",
      "regulation": "法规文本（如 EU Reg 2024/2754、EUR-Lex）",
      "customs": "海关税则（TARIC、WTO Tariff Facility）",
      "industry": "行业媒体/行业基准（CnEVPost、CarNewsChina、货运基准）",
      "primary": "一手数据（综合别名：官方渠道直接发布）",
      "secondary": "二手数据（转载/聚合目录，如 Autohome/懂车帝）",
      "evhub_calculation": "EV Hub 由公式/规则计算得出（如 landed_cost、VAT 叠加）",
      "evhub_estimate": "EV Hub 行业基准估算（如 RoRo 运费、认证费）"
    },
    "confidence_enum": {
      "high": "官方一手且经交叉核验",
      "medium": "官方+估算混合或单一官方未复核",
      "low": "三级/媒体来源或待核验"
    },
    "verified_date": {
      "type": "string (YYYY-MM-DD)",
      "desc": "最近一次人工/权威核验日期，逐字段或逐记录"
    },
    "legacy_source_type_mapping": {
      "regulation": "regulation",
      "customs tariff": "customs",
      "tax": "government",
      "spec": "manufacturer",
      "industry media": "industry",
      "catalog": "secondary",
      "tertiary": "secondary"
    },
    "migration_status": "sources[] 现有 8 条记录的 legacy source_type 保留原值，待批量迁移时按 legacy_source_type_mapping 归一化；517 个车型文件暂不批量加 field_sources。"
  }
}