If you mean the Dublin Core Metadata Element Set; it is not fully implemented in most ePub readers.
Eh... I'm not sure.. Let's say, when you open iBooks and sort this for line view, you can see Name, Author and so on. One is Category.
Books downloaded for free (with iBooks installation I think) have this information.
I do not have a definitive answer on this, but my understanding is that only a small number of the metadata fields in the EPUB are actually used by the reader - title and creator certainly.
I've played with adding values for all the other dc metadata fields and they do not appear in the iBooks reader. I believe Kobo supports a wider range, but I forget at the moment which that is.
The rest of the metadata about the book is effectively entered via the iBookstore submission process - and I suspect that includes Category.
Let us know how this work out for you.
Architect, InDesign Engineering
That's right Douglas, but it's recommended that eBook creators use these fields on the basis that reader manufacturers might, in due, course implement their use, if we don't use them there's no incentive for them to do so.
P.S. Did you receive my email and mock-up requesting color labeling be available for users creating Paragraph etc Styles?
Did you see that a Category field in File Info tabs allows you to write only 3 letters, not more. Is it some code?
The FileInfo route to exporting metadata to epub has been deprecated.
This is now entirely managed by the metadata tab in EPUB Export Dialog.