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Reference architectures such as ETSI's Network Function Virtualisation Reference Architecture has the potential not just to clarify terminology but to confuse it. We propose mapping such an architecture and the concepts therein into a properly defined ontology based upon a formal description logic semantics. This enables modelling and reasoning over such concepts. We extend this by showing how such a concept can be integrated with real-life components such as, in the example here, attestation and trust/integrity management in NFV itself.