{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "myst:frontmatter:1.10",
  "title": "MyST page frontmatter v1.10",
  "description": "The page-level MyST frontmatter fields, as of mystmd 1.10. MyST requires nothing: a page with no `title` takes one from its first heading. What this schema does carry is MyST's documented length caps — 500 characters on `title`, `subtitle`, `description` and `label`, 40 on `short_title` and `subject` — which are the constraints a long title silently violates. Project-level keys that belong in `myst.yml` (`bibliography`, `references`, `requirements`, `social`) are not described here; they are tolerated like any unknown key. Controlled vocabularies MyST defines but this schema does not reproduce — the 14 CRediT contributor roles above all — are checked for shape only, never against a transcribed list. See https://mystmd.org/guide/frontmatter",
  "type": "object",
  "additionalProperties": true,
  "$defs": {
    "person": {
      "description": "An author, editor or reviewer: an object, or a string referencing one declared elsewhere by id.",
      "if": { "type": "object" },
      "then": {
        "properties": {
          "name": {
            "type": ["string", "object"],
            "description": "Full name, or a CSL-JSON object of parsed name parts."
          },
          "id": { "type": "string" },
          "orcid": { "type": "string" },
          "email": { "type": "string", "format": "email" },
          "corresponding": {
            "type": "boolean",
            "description": "Marks the corresponding author. MyST requires an `email` alongside it."
          },
          "roles": {
            "type": "array",
            "items": { "type": "string" },
            "description": "CRediT contributor roles. Checked as strings only — the 14-term vocabulary and its aliases are not transcribed here, so a guessed enum cannot reject a valid role."
          },
          "affiliations": {
            "type": ["string", "array"],
            "items": { "type": ["string", "object"] }
          },
          "equal_contributor": { "type": "boolean" },
          "deceased": { "type": "boolean" },
          "note": { "type": "string" },
          "url": { "type": "string" }
        }
      },
      "else": { "type": "string" }
    },
    "people": {
      "if": { "type": "array" },
      "then": { "items": { "$ref": "#/$defs/person" } },
      "else": { "$ref": "#/$defs/person" }
    },
    "stringList": {
      "if": { "type": "array" },
      "then": { "items": { "type": "string" } },
      "else": { "type": "string" }
    }
  },
  "properties": {
    "title": {
      "type": "string",
      "maxLength": 500,
      "description": "Page title. When absent, MyST lifts it from the first heading and removes that heading from the content."
    },
    "subtitle": {
      "type": "string",
      "maxLength": 500,
      "description": "Complementary title text shown beneath the title."
    },
    "short_title": {
      "type": "string",
      "maxLength": 40,
      "description": "Abbreviated title for running headers and navigation. Capped at 40 characters."
    },
    "description": {
      "type": "string",
      "maxLength": 500,
      "description": "Summary of the page, used for previews and indexing."
    },
    "label": {
      "type": "string",
      "maxLength": 500,
      "description": "Identifier this page can be cross-referenced by."
    },
    "subject": {
      "type": "string",
      "maxLength": 40,
      "description": "Short subject categorization. Capped at 40 characters."
    },
    "date": {
      "type": "string",
      "description": "Publication date. MyST accepts ISO 8601 (`2026-08-23`) and RFC 2822 variants (`23 Aug 2026`), so this is not constrained to one format."
    },
    "keywords": {
      "$ref": "#/$defs/stringList",
      "description": "Key concepts described by the page."
    },
    "tags": {
      "$ref": "#/$defs/stringList",
      "description": "Categorization tags."
    },
    "authors": { "$ref": "#/$defs/people" },
    "editors": { "$ref": "#/$defs/people" },
    "reviewers": { "$ref": "#/$defs/people" },
    "affiliations": {
      "type": ["object", "array"],
      "items": { "type": ["string", "object"] },
      "description": "Institutions referenced by `authors`, declared inline or by id."
    },
    "license": {
      "type": ["string", "object"],
      "description": "An SPDX identifier such as `CC-BY-4.0`, or an object describing content and code licenses separately."
    },
    "copyright": { "type": "string" },
    "open_access": { "type": "boolean" },
    "doi": { "type": "string", "description": "A DOI, bare or as a URL." },
    "arxiv": { "type": "string" },
    "pmid": { "type": "integer" },
    "pmcid": {
      "type": "string",
      "pattern": "^PMC[0-9]+$",
      "description": "A PubMed Central id: the literal `PMC` followed by digits."
    },
    "github": {
      "type": "string",
      "description": "A repository URL, or `owner/name`."
    },
    "edit_url": { "type": "string", "format": "uri-reference" },
    "source_url": { "type": "string", "format": "uri-reference" },
    "binder": { "type": "string", "format": "uri-reference" },
    "thumbnail": { "type": "string" },
    "banner": { "type": "string" },
    "first_page": { "type": ["string", "number"] },
    "last_page": { "type": ["string", "number"] },
    "venue": { "type": ["string", "object"] },
    "volume": { "type": ["string", "number", "object"] },
    "issue": { "type": ["string", "number", "object"] },
    "funding": { "type": ["object", "array"] },
    "kernelspec": {
      "type": "object",
      "description": "Jupyter kernel this page executes against."
    },
    "execute": { "type": "object" },
    "math": {
      "type": "object",
      "description": "Macro dictionary applied to math on this page."
    },
    "abbreviations": { "type": "object" },
    "numbering": { "type": "object" },
    "parts": {
      "type": "object",
      "description": "Named parts such as `abstract` or `data_availability`."
    },
    "exports": { "type": ["object", "array"] },
    "downloads": { "type": ["object", "array"] },
    "options": { "type": "object" }
  }
}