What is EPUB?
- The EPUB content standard allows publishers to produce and send a single digital publication file through distribution and offers consumers interoperability between software/hardware for unencrypted reflowable digital books and other publications.
- “.epub” is the file extension for EPUB reflowable digital books and publications.
EPUB Acronym Soup
- Container: OCF (Open [OEBPS] Container Format)
- ZIP-based archive of publication parts
- Really just one extra file to point to root of publication and a defined directory structure
- Define mechanism for inclusion of alternate renditions,
- cryptography, signatures and rights information
- It’s just ZIP!
- Markup packaging: OPF (Open Packaging Format)
- Markup content: OPS (Open Publication Structure); XHTML & DTBook
EPUB is an OPS/OPF publication in an OCF container
What’s the difference between EPUB & PDF?
- PDF is pre-paginated and not easily re-flowed
- “Zoom” a PDF, see the upper left
- PDF is a print and print-archive format
- EPUB content, like XHTML, is re-flowable
- If paginated, when zoomed, there will be more “pages”
- OPS is a re-flowable “electronic content” format
- Adobe’s Digital Editions has adopted EPUB for such content