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[Overdog]

Ontology is the study of being or existence and its basic categories and relationships. It seeks to determine what entities can be said to "exist", and how these entities can be grouped according to similarities and differences. Ontology is distinguished from epistemology, the study of knowledge and what can be known.

Some philosophers, notably of the Platonic school, contend that all nouns refer to entities that have being. Other philosophers contend that nouns do not always name beings but provide a kind of shorthand for reference to a collection of either objects or events. In this latter view, mind, instead of referring to an entity, refers to a collection of mental events experienced by a person; society refers to a collection of persons with some shared characteristics, and geometry refers to a collection of a specific kind of intellectual activity. Any ontology must give an account of which words refer to entities, which do not, why, and what categories result. When one applies this process to nouns such as electrons, energy, contract, happiness, time, truth, causality, and god, ontology becomes fundamental to many branches of philosophy.

Ontology - Wikipedia, the free encyclopedia

I think you may be confusing Ontology with Constructivism...an epistemological point of view.

Constructivism
Constructivism is a philosophical position that views knowledge as the outcome of experience mediated by one's own prior knowledge and the experience of others. In contrast to objectivism (e.g. Ayn Rand, 1957) which embraces a static reality that is independent of human cognition, constructivism (e.g. Immanuel Kant, 1781/1787) holds that the only reality we can know is that which is represented by human thought. Each new conception of the world is mediated by prior-constructed realities that we take for granted. Human cognitive development is a continually adaptive process of assimilation, accommodation, and correction (Piaget, 1968). Social constructivists (e.g. Berger and Luckmann, 1966) suggest that it is through the social process that reality takes on meaning and that our lives are formed and reformed through the dialectical process of socialization. A similar dialectical relationship informs our understanding of science (e.g. Bloor, 1976), and it shapes the technical artifacts that we invent and continually adapt to our changing realities (e.g. Bijker, 1995). Humans are shaped by their interactions with machines just as machines evolve and change in response to their use by humans. (Lemke, 1993).

http://carbon.cudenver.edu/~mryder/s...constructivism

Constructivism