[xep-support] Feasibility of using block-containers to simulate change bars?

[DESEYNE Jacques]

All,
 
My internal customers have started to pronounce the term 'change bars'. Unless I have missed things (it has happened before :-), XEP
offers no support for this. I have experimented a little with absolutely-positioned block-containers (with a left c.q. right border
and containing nothing but an empty block) for each change (getting these is already a story of its own). I modify the intermediate
'at' xep format to get these polygons to the right placement and dimensions (relying on x-till etc. attributes of the 'change'
elements).
In my rather limited test cases, this approach gives reasonable visual results. Changes apply to both block-level components as to
in-line text portions.
 
Q: Is this worth investigating further? Can I rely on the sequence and syntax of elements in the xep intermediate format or am I
bound to get trapped by many issues I'm not (yet) thinking of? 
 
Any advice appreciated,
 
--
Jacques Deseyne
S.W.I.F.T. User Documentation Dept.
B-1310 La Hulpe
 
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