author/person items
It would be great to have separate author or person-cards, or items dedicated to a given author or person -- for instance, for biographical information in child notes, but also, for instance, to relate other bibliographic items that concern this author or person (in one way or the other) to the respective author or person-item.
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Further: why can't a user create his own item types?
And, BTW, person shouldn't be an item type. There really needs to be an agent object/table, which can handle both people and organizations.
With agents and events it would make it extremely easy to cross-reference many complicated relationships.