Further, creating and maintaining ontologies is both time-consuming and costly
(Simperl et al., 2009). Consequently, ontologies ought to be applied for as many
different tasks as possible to increase the return on the investment. Therefore, another
focus of the IIP project is reuse of the created ontology for rule-based notification and
semantic search (Gulla et al., 2006). Part 4 of the ISO 15926 ontology (ISO, 2007) will
also be specified in the Web Ontology Language (OWL).