{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://meshcognition.org/spec/mmp/schema/frame-registry.schema.json",
  "title": "MMP v2.0 Frame Registry",
  "type": "object",
  "additionalProperties": false,
  "required": ["$schema", "protocolVersion", "frames"],
  "properties": {
    "$schema": { "const": "https://meshcognition.org/spec/mmp/schema/frame-registry.schema.json" },
    "protocolVersion": { "const": "2.0" },
    "frames": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["type", "scope", "layer", "gated", "status", "schema", "fields"],
        "properties": {
          "type": { "type": "string", "pattern": "^[a-z][a-z0-9-]{0,63}$" },
          "scope": { "enum": ["peer", "relay"] },
          "layer": { "type": "string", "minLength": 1, "maxLength": 32 },
          "gated": { "type": "string", "minLength": 1, "maxLength": 32 },
          "status": { "enum": ["core", "transport", "legacy"] },
          "schema": {
            "anyOf": [
              { "type": "string", "pattern": "^[a-z0-9-]+\\.schema\\.json$" },
              { "type": "null" }
            ]
          },
          "fields": { "type": "string", "minLength": 1, "maxLength": 240 }
        }
      }
    }
  }
}