{
  "answer": "The fail-closed and compatible reference profiles reject the message because the receiver cannot safely apply a critical meaning it does not understand.",
  "canonicalUrl": "https://xn--mwe.com/questions/what-happens-to-unknown-critical-extension/",
  "claimStatus": "PROJECT DOCTRINE",
  "correctionStatus": "CURRENT K05 RELEASE",
  "detail": "The fail-closed and compatible reference profiles reject the message because the receiver cannot safely apply a critical meaning it does not understand. K10 keeps representation, evidence, authority, review, deployment, operation, and protected-information states separate.",
  "id": "K01-ANSWER-154",
  "lastReviewed": "2026-08-16",
  "question": "What happens to an unknown critical extension?",
  "releaseId": "K12-2026-08-16",
  "researchCutoff": "2026-08-16",
  "shortAnswer": "The fail-closed and compatible reference profiles reject the message because the receiver cannot safely apply a critical meaning it does not understand.",
  "slug": "what-happens-to-unknown-critical-extension",
  "sourceRevalidatedAt": "2026-08-15T23:00:00Z",
  "sources": [
    "SRC-W3C-PROV-O"
  ],
  "status": "PROJECT DOCTRINE",
  "topic": "machine-communication-protocols",
  "type": "Question"
}