(CDS) A model of programming language terms developed in the

context of constructing fully abstract semantics for

sequential languages. A CDS is a 4-tuple (C,V,E,|-) where C

is a cell, V is a value, E is an event and |- is an "enabling

relation". An event is a cell and a value. A cell C is

"enabled" by a set of events S if S |- C. A state is a set of

events which are consistent in that the values they give for

any cell are all equal. Every cell in a state is enabled.