structuring while giving enough freedom to open-ended, creative thinking. Many researchers and practitioners
argue about distinctions between ontology and a conceptual model. We suppose that ontology corresponds to
the analyst’s view of the conceptual model, but is not de facto the model itself. There are more than one
hundred of the techniques and notations that help to define and to visualize the conceptual models. Ontologies
now supposed to be one of the most universal and sharable forms of such modeling.
Frequently, it is impossible to express all the information as a single ontology. Accordingly, subject
knowledge storage provides for a set of related ontologies. Some problems may occur when moving from one
ontological space to another, but constructing meta-ontologies may help to resolve these problems.
Meta-ontology provides more general description dealing with higher level abstractions. Figure 1 illustrates
different ontology classifications in the form of the mind map. Mind-mapping ([2]) and concept mapping ([21])
are now widely used for visualizing of the ontologies at the design stage.