Classification systems are an essential part of the construction industry. They are used for managing project information, specifying building products, building information modelling and more. Since there is no common standard for classification systems, there are interoperability issues between the classification systems of different countries (e.g. UniClass in the UK, OmniClass in the US, and NZAMS in New Zealand). To compare or integrate projects or software using different classification systems, it becomes necessary to align the various classifications by mapping the classes to each other.