A method and system provides one or more product type descriptions, and constructs a map between the sub-conditions of the product type descriptions and constructs in a Web Ontological Language (OWL). The method converts the product type description rules into new OWL classes by creating a new OWL class for each corresponding rule; adding the new OWL class to the OWL ontology; for each condition of the corresponding rule, extracting sub-conditions; for each the sub-condition extracted; creating new constructs for the new OWL class using the map; and adding new class restrictions to the new OWL class, wherein each of the new class restrictions relates to a corresponding condition of the corresponding rule.