{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://schemas.vik.guru/a3-stacked-cube-atlas-expanded/0.2/source-registry.schema.json",
  "title": "A3 expanded source registry",
  "type": "object",
  "required": ["$schema", "schema_version", "as_of", "artifact_id", "extracted_from", "sources"],
  "properties": {
    "$schema": { "type": "string" },
    "schema_version": { "const": "0.2.0" },
    "as_of": { "type": "string", "format": "date" },
    "artifact_id": { "const": "A3-CUBE-EXPANDED" },
    "extracted_from": { "type": "string", "minLength": 1 },
    "sources": {
      "type": "array",
      "minItems": 1,
      "items": {
        "type": "object",
        "required": ["id", "title", "url", "role", "boundary"],
        "properties": {
          "id": { "type": "string", "pattern": "^SRC-[A-Z0-9]+(?:-[A-Z0-9]+)*$" },
          "title": { "type": "string", "minLength": 1 },
          "url": {
            "type": "string",
            "format": "uri",
            "description": "Public source URI or stable source-key URN."
          },
          "role": { "type": "string", "minLength": 1 },
          "boundary": { "type": "string", "minLength": 1 }
        },
        "additionalProperties": false
      }
    }
  },
  "additionalProperties": false
}