[alextweedly]

Thanks for both replies - answers all my points except one.

I described this poorly. When I said
A 'table' element allows sorting by multiple keys - though I can't remember how to do that, or how
get there. The navigation is, I find, sometimes unclear.

I should have said: A 'table' element allows you to specify that the table should be sorted by multiple keys (or at least, I'm sure I saw that once) - but I can't remember where, or find it again.