The subject is metadata.
Metadata is the information that is supposed to accompany each eBook so that things such as — but not limited to — arranging them by Writer or Genre or Publisher or Date Published is possible.
If you’re going on vacation, for example, and want to take along a mystery, how could you quickly find one in an eBook library comprised of several hundred editions?
Such sorting is why we have computers. They do the grunt work.
But they can only do it based on data. When the data — the metadata — isn’t there, all hell breaks loose and life is rotten for everybody.
The world runs on metadata. This financial mess we’re in? It’s all metadata — information abstracted from its original source. Metadata is derivative, abstracted data.
So if you think metadata is some little thing the world can do without, you are wrong.