Please note that the principal requirement for the PLCS TC is for structured sets of reference data with hierarchies to be referenced in a way similar to that noted by Ken.
However, we require to reference such hierarchies from a range of different representations of an ISO 10303 information model, including simple text files, XML and XML schema.
We are therefore using OWL to generate the necessary structures.
The simple list, if I may call it such, is a subset of this requirement.
Howard Mason
PLCS TC Co-Chair