Abstract
In this paper, we revisit the DEMO transaction pattern in light of the domain-independent system of categories put forth by the Unified Foundational Ontology (UFO). In this process, we treat social relationships in the scope of the DEMO transactions as objectified social entities, and thereby separate the behavioural and structural aspects of the transaction pattern and clarify their interplay. Further, we represent the pattern in the OntoUML ontology-driven conceptual modeling language. The revisited pattern can be embedded in broader enterprise ontologies and reference conceptual models based in UML. The proposed OntoUML models can also be further refined to account for and consider different organizational implementations of business transactions. We demonstrate the proposed representation by applying it to OMGs EU-Rent case.