{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://openpresentation.org/schema/opf-layout-preview-index/v1",
  "title": "Layout Preview Index",
  "description": "Shape of `spec/previews/layouts/index.json`, the manifest for the vendored slide-archetype preview gallery under `spec/previews/layouts/`. Each record names a preview id, its self-contained HTML file, and the file's exact UTF-8 byte length. These preview ids are an archetype taxonomy (e.g. 'swot-analysis', 'org-chart') distinct from the structural layout catalog at spec/catalogs/layouts/ (e.g. 'title', 'chart-2x') — see spec/README.md. This schema describes a repo-internal index file, not an OPF document or a catalog record; it is intentionally excluded from the package's published/typed schema surface.",
  "type": "object",
  "required": ["$schema", "version", "description", "records"],
  "additionalProperties": false,
  "properties": {
    "$schema": {
      "type": "string",
      "const": "https://openpresentation.org/schema/opf-layout-preview-index/v1"
    },
    "version": {
      "type": "string",
      "description": "Index format version, as a string.",
      "examples": ["1"]
    },
    "description": {
      "type": "string",
      "description": "Human-readable description of the preview gallery and its rendering conventions."
    },
    "records": {
      "type": "array",
      "description": "One entry per vendored preview HTML file.",
      "items": { "$ref": "#/$defs/PreviewRecord" }
    }
  },
  "$defs": {
    "PreviewRecord": {
      "type": "object",
      "description": "Summary of one vendored preview HTML file.",
      "required": ["id", "file", "bytes"],
      "additionalProperties": false,
      "properties": {
        "id": {
          "type": "string",
          "description": "Slide-archetype preview id (e.g. 'swot-analysis', 'agenda', 'org-chart'). Does not correspond to a spec/catalogs/layouts/ record id.",
          "pattern": "^[a-z][a-z0-9-]*$"
        },
        "file": {
          "type": "string",
          "description": "HTML filename, relative to this index file's directory.",
          "pattern": "^[^/]+\\.html$"
        },
        "bytes": {
          "type": "integer",
          "minimum": 0,
          "description": "Exact UTF-8 byte length of the referenced HTML file's contents."
        }
      }
    }
  }
}