configuring paragraph breaks

So let’s say someone wants to configure output for annotated
bibliographies, where notes are printed as paragraph(s) following the
citation. How should I configure that?

Using prefix and suffix feels wrong.

Off the top of my head, one option would be to allow an optional
"block" attribute on note and abstract? Something like:

<notes block="true"/>

Default is thus understood as inline/span.

Well, come to think of it, shall we just say that these are by
definition block structures? It wouldn’t make much sense to treat them
as anything but, would it?

The solution would then be simple (documentation, without markup).