class EnhancedMetadata {
  final String? series;
  final double? seriesPosition;
  final String? publisher;
  final String? language;
  final String? isbn;

  const EnhancedMetadata({
    this.series,
    this.seriesPosition,
    this.publisher,
    this.language,
    this.isbn,
  });

  const EnhancedMetadata.empty()
      : series = null,
        seriesPosition = null,
        publisher = null,
        language = null,
        isbn = null;
}