A typical index inside an EPUB 3 book:
Once files are sourced from an index, managing a growing digital library requires the right software ecosystem. The Gold Standard: Calibre index of epub books updated
As the digital ecosystem continues to mature, the tools we use to organize and discover the written word will only grow more sophisticated, keeping the global index of human knowledge permanently updated and available at our fingertips. A typical index inside an EPUB 3 book: