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When trying to determine what metadata should be appropriate for a
project, a good starting base is the Dublin core, which was designed
as a common base appropriate for a large number of situation. This is
thus even more recommended if you want meta data for an heterogeneous
set of resources.

Of course, you may want to adapt it a bit what you have more clearly
identified resources that you want to characterize with the metadata.
For example, the identifier of a book can be the ISBN.

The Dublin core standard gives you a fairly limited list of 15 types of metadata, and also standard names for others that are often used.
It is pretty much up to you to determine what metadata are really
useful for the purposes of your users, as only you know what services
you wish to offer.

It may be wise to architecture your software so that you can easily
modify it by adding or removing a given type of metadata, as may
appear necessary when your plateform is being used.

What kind of metadata not to show is an inappropriate question, since
this is clearly an infinite set. For example metadata could include
the number of pages of the first edition, or the physical size these
pages, or the birth date of the author.


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