{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://velopair.org/schemas/0.1/compatibility.schema.json",
  "$comment": "DRAFT for developer review. Name: VeloPair (gate #1 closed 2026-08-17); attorney trademark clearance still pending. This object records the OUTPUT of a scoring engine. The standard deliberately defines no scoring mathematics: engines compete on the same data (design principle 1), and scoring mechanisms are patent-encumbered territory (see docs/RESEARCH.md section 4, Giant US 11878214).",
  "title": "Compatibility",
  "description": "A match result: which engine looked at which rider, ride profile and bike, and what it concluded. Scores are engine-specific and comparable only within one engine and version.",
  "type": "object",
  "required": [
    "spec_version",
    "engine",
    "score"
  ],
  "additionalProperties": false,
  "properties": {
    "spec_version": {
      "type": "string",
      "pattern": "^\\d+\\.\\d+\\.\\d+(-[0-9A-Za-z.]+)?$",
      "description": "Version of this specification the document conforms to.",
      "examples": [
        "0.1.0"
      ],
      "maxLength": 32
    },
    "engine": {
      "type": "object",
      "description": "Who computed this. Mandatory: a score without an engine is meaningless under the data-not-score architecture.",
      "required": [
        "name"
      ],
      "additionalProperties": false,
      "properties": {
        "name": {
          "type": "string",
          "minLength": 1,
          "maxLength": 200
        },
        "version": {
          "type": "string",
          "maxLength": 64
        },
        "url": {
          "type": "string",
          "format": "uri",
          "maxLength": 500
        }
      }
    },
    "computed_at": {
      "type": "string",
      "format": "date-time",
      "description": "When the score was computed (RFC 3339)."
    },
    "rider_ref": {
      "type": "string",
      "minLength": 1,
      "description": "profile_id of the Rider document used as input.",
      "maxLength": 128
    },
    "ride_profile_ref": {
      "type": "string",
      "minLength": 1,
      "description": "profile_id of the Ride Profile document used as input.",
      "maxLength": 128
    },
    "bike_ref": {
      "type": "string",
      "minLength": 1,
      "description": "profile_id of the Bike document used as input.",
      "maxLength": 128
    },
    "score": {
      "type": "number",
      "minimum": 0,
      "maximum": 100,
      "description": "Overall match score, 100 is best."
    },
    "confidence": {
      "type": "number",
      "minimum": 0,
      "maximum": 1,
      "description": "The engine's own confidence in the score, typically driven by input completeness."
    },
    "breakdown": {
      "type": "array",
      "description": "Optional per-dimension scores. Dimension names are engine-defined, not standardized.",
      "items": {
        "type": "object",
        "required": [
          "dimension",
          "score"
        ],
        "additionalProperties": false,
        "properties": {
          "dimension": {
            "type": "string",
            "minLength": 1,
            "maxLength": 100
          },
          "score": {
            "type": "number",
            "minimum": 0,
            "maximum": 100
          },
          "note": {
            "type": "string",
            "description": "Human-readable reasoning for this dimension.",
            "maxLength": 2000
          }
        }
      },
      "maxItems": 50
    },
    "extensions": {
      "type": "object",
      "description": "Engine-specific data under reverse-domain keys. Consumers must ignore unknown extensions.",
      "additionalProperties": true
    }
  }
}