{
  "headKeys": [
    "kind",
    "carrier",
    "genre",
    "title",
    "composition-grammar",
    "shell-grammar",
    "brand",
    "critic-profile",
    "language",
    "audience",
    "status"
  ],
  "matterDirectives": [
    "front-matter",
    "main-matter",
    "back-matter"
  ],
  "compatMatterDirectives": [
    "frontmatter",
    "mainmatter",
    "backmatter"
  ],
  "universalStructureDirectives": [
    "section",
    "subsection",
    "subsubsection"
  ],
  "stageDirectives": [
    "frameset",
    "frame",
    "frame-section",
    "appendix-frameset",
    "zone"
  ],
  "nonStageDirectives": [
    "codex",
    "chapter",
    "spread",
    "appendix",
    "reference-apparatus",
    "stream",
    "file-segment",
    "anchor",
    "support-matter",
    "jump",
    "tableau-document",
    "page-family",
    "tableau-page",
    "region-group",
    "hero-region",
    "support-region",
    "field-document",
    "sheet",
    "perimeter",
    "top-band",
    "bottom-band",
    "side-band",
    "region",
    "register",
    "collection",
    "schema",
    "record",
    "form",
    "dashboard",
    "constraint",
    "box",
    "tag-catalog",
    "fragment",
    "subcollection",
    "cluster",
    "saved-view",
    "thread",
    "participant-profile",
    "topic-briefing",
    "conduct-doctrine",
    "episode",
    "branch",
    "turn",
    "attachment-ref",
    "outcome"
  ],
  "stageZoneSelectors": [
    "header",
    "main",
    "aside",
    "footer",
    "background",
    "overlay",
    "label",
    "badge",
    "payload"
  ],
  "deprecatedStageDirectives": [
    "slide",
    "slide-section"
  ],
  "deprecatedLegacyDelimiters": [
    "%%%",
    "%%",
    "%"
  ]
}