The RDF language provides a nice example of how context
and grammar are related (the attached HTML file can be
displayed using the command "mKE --view rdf").
The entire Container-Property-Statement hierarchy
is the context of the RDF language.
The propositions of this hierarchy are relations
between parts of the RDF language.
The grammar of the RDF language is the propositions
which are subclasses of "Statement". For example
Container member Resource;
includes all propositions of the form
subject member object;
where subject is a container and object is a resource.
This CPS hierarchy is a physical context.
It does not include "Class",
which is part of the mental context.
Context Knowledge Systems
Name your propositions !