by what we would have to call a &quot;propositional expression&quot;
or a &quot;sentence&quot;.  Given the structure of a domain of propositions,
we can generally recognize any number of more concrete domains
that have the same structure, and we may then refer to these
as &quot;interpretations&quot;, &quot;realizations&quot;, or &quot;representations&quot;
of the abstract structure, though, of course, these are
extremely overloaded terms, and have to be taken only
in the context that makes clear how they ar