[From Steve Newhouse:]

The main difference (at first glance) is a distinct Hold state for each 
primary state - although BES records the proceeding state so the BES 
generic Hold is qualified with where it came from. Dave Snelling stated 
that the state model was still under discussion so no further comment will 
be made here. However, it appears to be clear that different state models 
may be associated with different activities - and in many cases may be 
simpler that either the BES or ESI document. Perhaps linking the state 
model to the JSDL application type (e.g. POSIX) may be a way forward? This 
would allow (say) a WebServiceApplication type in the JSDL document to 
have a very simple model (running/not running). 
.