{
  "schema_version": "1.0",
  "registry": {
    "id": "WHW-SOURCE-REGISTRY",
    "owner": "Wong Hong Wei",
    "last_reviewed": "2026-08-25",
    "scope": "Sources currently used by published flagship knowledge and design-method pages. This is not a comprehensive bibliography."
  },
  "sources": [
    {
      "id": "WHW-SRC-SGMJ-GUIDE",
      "name": "WongHongWei.com Singapore Mahjong Guide",
      "publisher": "Wong Hong Wei",
      "url": "https://wonghongwei.com/singapore-mahjong-guide/",
      "kind": "first-party-documentation",
      "used_by": [
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        "singapore-mahjong-ping-hu"
      ],
      "checked_on": "2026-08-25",
      "claim_boundary": "Documents this site's practice rules and clearly labelled alternatives; it is not a universal Singapore rules authority."
    },
    {
      "id": "WHW-SRC-SGMJ-ENGINE",
      "name": "WongHongWei.com Singapore Mahjong practice table and scorer",
      "publisher": "Wong Hong Wei",
      "url": "https://wonghongwei.com/singapore-mahjong/",
      "kind": "first-party-implementation",
      "used_by": [
        "singapore-mahjong-ping-hu"
      ],
      "checked_on": "2026-08-25",
      "claim_boundary": "Implementation evidence for this site's ruleset, not evidence that every household uses the same rules."
    },
    {
      "id": "WHW-SRC-SGMJ-COMMUNITY-RULES",
      "name": "SingaporeMahjong.com rules",
      "publisher": "SingaporeMahjong.com",
      "url": "https://singaporemahjong.com/rules/",
      "kind": "external-ruleset",
      "used_by": [
        "singapore-mahjong-ping-hu"
      ],
      "checked_on": "2026-08-25",
      "claim_boundary": "A published comparison ruleset, not an official or exhaustive description of Singapore household practice."
    },
    {
      "id": "WHW-SRC-SGMJ-SPGG-2024",
      "name": "Singapore Polytechnic Graduates' Guild Mahjong Rules and Regulations, January 2024",
      "publisher": "Singapore Polytechnic Graduates' Guild",
      "url": "https://www.spgg.org.sg/web/content/114907/",
      "kind": "external-competition-ruleset",
      "used_by": [
        "singapore-mahjong-ping-hu"
      ],
      "checked_on": "2026-08-25",
      "claim_boundary": "Competition rules for a named organiser and date, not a universal household ruleset."
    },
    {
      "id": "WHW-SRC-ECDA-EYDF-2023",
      "name": "ECDA Educators' Portal: Early Years Development Framework and guides",
      "publisher": "Singapore Early Childhood Development Agency",
      "url": "https://www.ecda.gov.sg/beanstalk/educators-portal/?ag=011",
      "kind": "official-guidance",
      "used_by": [
        "foxys-learning-patch",
        "foxy-screen-light-standard"
      ],
      "checked_on": "2026-08-25",
      "claim_boundary": "Used to describe broad design intent only. Foxy is not accredited, endorsed or reviewed by ECDA."
    },
    {
      "id": "WHW-SRC-HEALTHHUB-SCREEN-TIME",
      "name": "Parent Hub: screen-time guidance for babies and toddlers",
      "publisher": "HealthHub Singapore",
      "url": "https://www.healthhub.sg/programmes/parent-hub/baby-toddler/screen-time",
      "kind": "official-health-guidance",
      "used_by": [
        "foxy-screen-light-standard"
      ],
      "checked_on": "2026-08-25",
      "claim_boundary": "Context for a screen-light design commitment, not medical advice or evidence of developmental benefit."
    }
  ]
}