We propose an Open SEA (Open Semantic Enterprise Architecture) as a conceptual framework for enterprise interoperability that combines ontology of enterprise architecture with an abstract syntax for logic systems. This framework could provide the foundations for different domains using different ontologies and different systems to interoperate at a semantic level and provide meaningful descriptions to all levels of the enterprise. As such business processes, web services, data and skills could all be traded across open networks. This framework refers to the open standards of TOGAF9 and ISO 24707:2007 Common Logic to create a Semantic Enterprise Architecture, hence Open SEA. Specifically, we provide an overview of how terms used by TOGAF can be represented using Common Logic and specialized with different logic systems and terminology yet retaining enough commonality to allow meaningful communication across open networks.