{
  "knowledgeBase": "second-hand-housing-transaction-decision",
  "release": "2026.07.16-decision-r1",
  "schemaVersion": "2.0.0",
  "asOfDate": "2026-07-16",
  "reviewStatus": "validated_snapshot",
  "coverage": {
    "executableRules": 70,
    "cityEligibilityRules": 56,
    "nationalRules": 14,
    "goldenCases": 348,
    "validationAssertions": 4159
  },
  "scope": {
    "buyer": "natural_person",
    "seller": "natural_person",
    "transaction": "ordinary_second_hand_residential_sale",
    "excludes": [
      "enterprise_purchase",
      "inheritance",
      "gift",
      "judicial_auction",
      "non_residential",
      "rural_homestead",
      "unclassified_policy_housing"
    ]
  },
  "resultStatuses": ["eligible", "ineligible", "conditional", "unknown", "out_of_scope"],
  "nationalPackages": [
    "national/tax-rules.json",
    "national/evidence.json"
  ],
  "cityPackages": [
    { "code": "110000", "name": "北京", "file": "cities/110000-beijing.json" },
    { "code": "440300", "name": "深圳", "file": "cities/440300-shenzhen.json" },
    { "code": "440100", "name": "广州", "file": "cities/440100-guangzhou.json" },
    { "code": "310000", "name": "上海", "file": "cities/310000-shanghai.json" },
    { "code": "120000", "name": "天津", "file": "cities/120000-tianjin.json" },
    { "code": "420100", "name": "武汉", "file": "cities/420100-wuhan.json" },
    { "code": "330100", "name": "杭州", "file": "cities/330100-hangzhou.json" },
    { "code": "320500", "name": "苏州", "file": "cities/320500-suzhou.json" },
    { "code": "510100", "name": "成都", "file": "cities/510100-chengdu.json" },
    { "code": "500000", "name": "重庆", "file": "cities/500000-chongqing.json" },
    { "code": "610100", "name": "西安", "file": "cities/610100-xian.json" },
    { "code": "320100", "name": "南京", "file": "cities/320100-nanjing.json" }
  ],
  "schemas": {
    "scenario": "schemas/scenario.schema.json",
    "rule": "schemas/rule.schema.json",
    "evaluation": "schemas/evaluation.schema.json"
  },
  "tests": "tests/golden-cases.json",
  "governance": {
    "effectiveDateSelection": "effective_from <= query_date < effective_to",
    "unknownOnConflict": true,
    "unknownOnMissingRequiredInput": true,
    "officialSourcesOnlyForExecutableRules": true,
    "automaticRulePublication": false
  }
}