Abstract
In this paper we present an ontology for transaction services built upon an established ontology for corporate knowledge called the Enterprise Ontology. We introduce the SmartGov platform for the 'Smart' deployment of online services for Public Authorities (PAs) whose requirement of a model of PAs has motivated the ontology, and describe our approach to constructing it. After presenting the ontology we then relate it to the pilot application areas in which the SmartGov platform will be trialed and evaluated.