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Although reading books is often properly implemented even on older ebook readers (including bookmarks), selecting a book from those available on the device is often a cumbersome affair. This gives the impression that some ebook device developers only tried the device with a handful of books instead with a more realistic number of a few thousand books.
An ebook reader should allow you to browse the book collection using a flexible hierarchical structure (and not just by author name and book title). This structure can be based on a directory structure you specify on the storage medium, combined with metadata taken from the book; or on metadata only.
When using the directory structure to browse, the directory can only be browsed by directory name (as a directory, in contrast to an ebook file, has no metadata). The individual files should be browsable by file name or by various elements of a file's metadata.
Metadata
The ebook reader should allow
sorting of books by author in sorted order of author name (not the normal name).
sorting by series and number of a book within that series.
sorting by title (sort version if available).
sorting by year of publication
sorting by language
The order of applying these sorting of data has to be non-fixed. You have to be able to specify the order of all of these sorting elements as per your needs. This allows you to traverse a hierarchy ordered on the first level by author, than by language of the book and then by title at one time; and by language, author, series, series-number at some other time, etc.
Details for EPUB
An EPUB ebook reader should always sort authors by a <creator>'s file-as attribute instead of the non-tag part of the <creator> element (sorting by the non-tag part can be made user selectable, but this is seldom necessary). Thus
<dc:creator opf:role="aut" opf:file-as="Asimov, Isaac">Isaac Asimov</dc:creator>
will be sorted under 'A'.
Unfortunately the EPUB <title> tag has no such defined sorting option, but if a <meta> tag is available with attribute name="title_sort" the elements content tag value should have sorting preference.
At no time should it be necessary to mangle an ebook's filename or its metadata to get a usable selection hierarchy. Unfortunately on some deficient readers you have to corrupt the above mentioned data, e.g. the <creator> tag to:
<dc:creator opf:role="aut">Asimov, Isaac</dc:creator>
in order to get a book sorted under author name 'A'
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