{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "pxp/v0/envelope.schema.json",
  "title": "PXP Envelope v0",
  "type": "object",
  "required": ["pxp", "room", "seq", "from", "intent_hash", "message", "claims", "reviews", "status"],
  "properties": {
    "pxp": { "const": "0" },
    "room": { "type": "string" },
    "seq": { "type": "integer", "minimum": 1 },
    "from": {
      "type": "object",
      "required": ["seat", "principal", "speaker"],
      "properties": {
        "seat": { "type": "string" },
        "principal": { "type": "string" },
        "speaker": { "enum": ["proxy", "principal"] }
      }
    },
    "intent_hash": { "type": "string", "pattern": "^[a-f0-9]{64}$" },
    "message": { "type": "string" },
    "claims": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["id", "text", "origin"],
        "properties": {
          "id": { "type": "string" },
          "text": { "type": "string" },
          "origin": { "enum": ["stated", "sourced", "assumed"] },
          "ref": { "type": "string", "description": "Card clause or source. Required for stated and sourced." }
        }
      }
    },
    "reviews": {
      "type": "array",
      "items": {
        "type": "object",
        "required": ["claim_id", "verdict"],
        "properties": {
          "claim_id": { "type": "string" },
          "verdict": { "enum": ["accept", "challenge", "conflict"] },
          "reason": { "type": "string" }
        }
      }
    },
    "proposal": {
      "type": "object",
      "properties": {
        "terms": { "type": "array", "items": { "type": "string" } },
        "depends_on": { "type": "array", "items": { "type": "string" }, "description": "Claim ids the terms rely on" }
      }
    },
    "status": { "enum": ["continue", "agree", "escalate"] },
    "escalation": {
      "type": "object",
      "properties": {
        "question": { "type": "string" },
        "reason": { "type": "string" }
      }
    }
  }
}