In previous SSP meeting we have discussed coordination of agents and Web services using protocols constraining the social norms of interaction between problem solvers. Taking this as a point of departure, we shall discuss how ontological constraints might fit into this picture. In particular, we shall look at a proposal for a simple means of performing ontology checks on protocols. There will, I'm afraid, be quite a lot of "in your face" source code for the necessary knowledge representation and translation mechanisms.