The goal of the IIP project is to extend and formalise existing terminology for the
petroleum industry standard ISO 15926 (Gulla et al., 2006). ISO 15926 consists of
seven parts, but part 4 (ISO, 2007), the Reference Data Library (RDL), is the focus of
the project. Part 4 is comprised of application and discipline-specific terminologies but
the project focuses on terminologies for subsea equipment used by the oil and gas
industry in particular. These terminologies, described as RDL classes, are instances of
the data types from part 2.