41. DMOZ uses a hierarchical ontology scheme for organizing site listings. 42. The classes of an ontology may be extensional or intensional in nature. 43. In most upper ontologies , the classes are defined intensionally. 44. These are useful, but are not considered true ontologies . 45. Within the ontology of color there are various competing types of theories. 46. These relationships include class membership, ontologies , situations, and inheritance. 47. Ontologie . ( There is no universal ontology .) 48. Numerous efforts have been made to define a process / planning ontology . 49. Krausz probes the relation between these ideals of interpretation and their ontologies . 50. Ontologies represent classification systems that provide controlled and structured vocabularies.
