/**
 * @fileoverview Parses one Project Gutenberg per-book RDF/XML document into the
 * same normalized {@link Book} shape `GutendexService` produces from the Gutendex
 * JSON API, so a mirror-served record and a live-served record are interchangeable.
 *
 * The field mapping mirrors Gutendex's own RDF reader (`books/utils.py` +
 * `books/serializers.py` in garethbjohnson/gutendex), which is what populates the
 * live API this server falls back to. Every ordering, de-duplication, and default
 * below exists because Gutendex does the same thing — deviating would make the two
 * paths return different records for the same book.
 * @module services/catalog-mirror/rdf-book-parser
 */
import { type Book } from '../gutendex/types.js';
/**
 * Parse a per-book RDF document into a normalized book record.
 *
 * @param xml - Contents of one `pg<id>.rdf` file.
 * @param id - Gutenberg ID, taken from the archive path rather than the document so a
 *   record can never be filed under an ID the mirror did not ask for.
 * @returns The normalized book, or null when the document carries no `pgterms:ebook`
 *   element (a placeholder or truncated entry, which is skipped rather than stored).
 */
export declare function parseBookRdf(xml: string, id: number): Book | null;
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