# Computer Dictionary/Concrete Data Structure

From En.18dao.net

(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.

[G. Berry, P.-L. Curien, "Theory and practice of sequential algorithms: the kernel of applicative language CDS", Algebraic methods in semantics, CUP 1985].