[senhal]

Originally Posted by eschwartz

That is a good idea and I added an option to keep three pieces of non dc: metadata

• <meta name=cover content="mycover"/>
• <meta name="calibre:series" content="Some Series">
• <meta name="calibre:series_index" content="some_series_number">

What does everyone think?
Is there anything else people will usually want to keep?

That's great, thanks!
I'm using also comments inside the opf file, like this:

<!--bla bla bla-->

But I understand this is a very personal thing...