{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://oco-adam.github.io/specgraph/schemas/graph-index.schema.json",
  "title": "Spec Graph Generated Edge Index",
  "description": "Optional generated adjacency index derived from node-local links. This is a derived artifact — the source of truth is always the links field in each node file.",
  "type": "object",
  "required": ["specgraphVersion", "generatedFrom", "edges"],
  "additionalProperties": false,
  "properties": {
    "$schema": { "type": "string" },
    "specgraphVersion": {
      "type": "string",
      "pattern": "^\\d+\\.\\d+\\.\\d+(-[0-9A-Za-z-.]+)?$"
    },
    "generatedFrom": {
      "type": "object",
      "additionalProperties": false,
      "required": ["graphPath"],
      "properties": {
        "graphPath": {
          "type": "string",
          "pattern": "^(?!/)(?!.*\\.{2}/)[A-Za-z0-9._/-]+\\.json$"
        },
        "graphSha256": {
          "type": "string",
          "pattern": "^[A-Fa-f0-9]{64}$"
        }
      }
    },
    "edges": {
      "type": "array",
      "items": {
        "type": "object",
        "additionalProperties": false,
        "required": ["from", "type", "to"],
        "properties": {
          "from": {
            "type": "string",
            "minLength": 1,
            "maxLength": 80,
            "pattern": "^[A-Z][A-Z0-9-]{0,79}$"
          },
          "type": {
            "type": "string",
            "enum": [
              "contains",
              "depends_on",
              "constrains",
              "implements",
              "derived_from",
              "verified_by",
              "supersedes"
            ]
          },
          "to": {
            "type": "string",
            "minLength": 1,
            "maxLength": 80,
            "pattern": "^[A-Z][A-Z0-9-]{0,79}$"
          }
        }
      }
    }
  }
}