Tom The aspect I am exploring is this:
Does numbering behavious occur uniformly for a *given* level? For example, are we talking of a scenario where level 3 heading in Tree-1 is numbered while level 3 heading on a Tree-2 is unnumbered. What would be the behaviour of level 4 heading in Tree-1. It seems to me, that an unnumbered heading is a mnemonic(?) for creating a paragraph (albeit a short one) that is styled very much like a heading. When one looks at a printed document, one doesn't really know what mechanism were used to achieve a particular typesetting effect and there could be multiple mechanisms by which the same effect could be achieved. If the above paragraph is true , I think the right thing to do would be to associate a paragraph style with *just* the heading component of an Org's outline level and leave it to the exporter what particular code it wants to emit. --
