{
  "version": "0.1.0",
  "corpus_columns": {
    "id": "stable canonical text-unit identifier",
    "text": "self-contained accepted text",
    "unit_kind": "book/article/cordel/selected_segment/etc.",
    "parent_document_id": "parent edition/document ID when unit is a selected segment",
    "segment_index": "stable segment index within parent document",
    "title": "source title; FE segments retain parent edition title",
    "primary_authors": "creators of the literary text",
    "editors": "modern editors/compilers where applicable",
    "genre": "curated/model-assisted broad genre",
    "year": "source/edition year when available",
    "date_label": "human-readable historical content period when available",
    "language": "language code",
    "source": "specific source",
    "source_family": "coarse source family",
    "source_collection": "collection/journal/source subcollection",
    "source_id": "stable source-specific identifier",
    "landing_url": "provenance landing page",
    "source_file_url": "upstream source-file URL for provenance; not needed to use frozen corpus",
    "rights_tier": "project rights tier",
    "license": "human-readable license/public-domain label",
    "license_url": "license URL when available",
    "rights_evidence": "why this unit was admitted",
    "text_variant": "original; AO90 normalization is future separate derivative",
    "orthography_hint": "historical/contemporary hint; original text is never overwritten",
    "extraction_method": "how text was originally extracted or assembled",
    "quality_label": "source-stage quality label",
    "text_sha256": "SHA-256 of exact UTF-8 canonical text string",
    "char_count": "Python Unicode character count of canonical text",
    "word_count": "whitespace-split word count; not a tokenizer token count"
  },
  "auxiliary_tables": {
    "documents": "document/edition hierarchy and parent metadata",
    "review_inventory": "deferred/review queues; contains no training text",
    "curation_lineage": "acceptance/dedup/curation provenance",
    "audit_metrics": "legacy project token estimates/hashes kept out of canonical schema"
  }
}