Representing information for the starting/ending/standalone parts

My personal preference would be:  --- b) Variation of a) but using two different attribute for <pc> to be a bit clearer? [this is the one we have been using so far]  <ph id='1' disp="[br/]"/> <sc id='1' disp="[b]"/> <ec id='1' disp="[/b]"/> <pc id='1' dispStart="[b]" dispEnd="[/b]"/> ---  The rationale being that adding 'Start' or 'End' to the attribute is redundant when in a start/end code. It may even be leading the user to think there is a dispEnd if she sees a dispStart in a <sc>.  Cheers,  -ys