[developers] boring though important: generalizing characterization

[Ann Copestake]

this proposal appears to be missing the generalised notion of character ranges 
that we require for XML input - i.e., the combination of xpath with character 
position.  The token lattice notion is _not_ adequate for our purposes, given 
that we require a general notion of standoff annotation that can work with 
multiple tokenisations (and indeed, for processing that is not token based).  
Uli and Ben have both done extensive work on this.

Ann