- EPUB Container, XHTML files in a zip container.
- EPUB Package, a way to relate components of an EPUB to each other. This may include various metadata, index, table of contents and spine information.
- EPUB Canonical Fragment Identifier (CFI), a mechanism for describing a location within an EPUB.
- Media Overlays, which allow to synchronize audio tracks with text content in a book.
There are two omissions however, namely searching and pagination. We will describe searching in a future article and tackle pagination today.