...ontology engineering methods have so far neglected the early phase of ontology building where a conceptualization only exists rather informally and undergoes continuous evolution through collaboration and interaction within the community ... current research and development concentrates more on what we can do as soon as we have ontologies—rather than having a closer look at the processes of creating and especially maintaining such (domain-specific) ontologies. .... The main challenge is then how to leverage this implicit and informal ontology building for the explicit formal models needed for semantic approaches. I