[tei-council] More questions on tcw21

[Lou Burnard]

Thanks for the response so far to my posting yesterday about the Big 
Questions.  Here, as promised, are some more questions...

1. transcription units: we propose using <line> <ab> or <seg>. What
guidelines should we offer about when to choose which, beyond the 
following:
   - <seg> can be used within the other two to delimit any kind of unit
   - <line> implies a topographic line of some kind
   - <ab> implies any kind of block, possibly but not necessarily 
containing multiple <line>s

2. discussion of spanTo needs expansion. Some more real examples would
help.

3. Should <metaMark> possibly have a <desc> child to describe it
rather than relying on brief characterisation as attribute values?

4. The graphics included should all have proper citation
information. Do we want so many? Can we find better (clearer) ones?