On 21.05.2013 20:14 Eric Lease Morgan wrote:

> The convention I have always used included the first word of the author's last name, the first (non-stop) word of the title, and an integer (accession number):
>   plato-republic-105.epub

It has the advantage of being short but I would like a bit more info, at
least publication year and a longer part of the title and the/a ISBN.
Perhaps I will just make something up myself.

Since I would also like to include the ISBN, is there such a thing like
a "main" or "master" ISBN in case a work has more than one of them? I am
looking for something like the ISSN-L, but of course for books instead
of journals. Something like the reverse of the xISBN service: 'many to
one' instead of 'one to many'.
If there is nothing like that I might just use the first one given in
the book.