There is a preprint of my paper submitted to FAC here: http://www-staff.lboro.ac.uk/~coael/download/thcspp.ps.gzThis presents all the glorious details of the partial order acceptance semantics. There are sure to be many mistakes and stupidities. Please help me find them.
The pseudo-metric structure is described in another paper which I haven't had time to knock into shape yet.
Adrian Lawrence