Individuals
Individuals (instances) are the basic, "ground level" components of an ontology. The individuals in an ontology may include concrete objects such as people, animals, tables, automobiles, molecules, and planets, as well as abstract individuals such as numbers and words (although there are differences of opinion as to whether numbers and words are classes or individuals). Strictly speaking, an ontology need not include any individuals, but one of the general purposes of an ontology is to provide a means of classifying individuals, even if those individuals are not explicitly part of the ontology.
In formal extensional ontologies, only the utterances of words and numbers are considered individuals – the numbers and names themselves are classes. In a 4D ontology, an individual is identified by its spatio-temporal extent. Examples of formal extensional ontologies are ISO 15926 and the model in development by the IDEAS Group.
Read more about this topic: Ontology Components
Famous quotes containing the word individuals:
“As individuals and as a nation, we now suffer from social narcissism. The beloved Echo of our ancestors, the virgin America, has been abandoned. We have fallen in love with our own image, with images of our making, which turn out to be images of ourselves.”
—Daniel J. Boorstin (b. 1914)
“It is for want of a man that there are so many men. It is individuals that populate the world.”
—Henry David Thoreau (1817–1862)
“Generalisation is necessary to the advancement of knowledge; but particularly is indispensable to the creations of the imagination. In proportion as men know more and think more they look less at individuals and more at classes. They therefore make better theories and worse poems.”
—Thomas Babington Macaulay (1800–1859)