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Semantic Web for the Working Ontologist, 2nd Edition by James Hendler, Dean Allemang

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Computing Sameness—Functional Properties

Functional Properties in OWL get their name from a concept in mathematics, but like most of the OWL constructs, they have a natural interpretation in everyday life. A function property is one for which there can be just one value. Examples of such properties are quite common: hasMother (since a person has just one biological mother), hasBirthplace (someone was born in just one place), and birthdate (just one) are a few simple examples.

In mathematics, a function is a mapping that gives one value for any particular input, so x2 is a function, since for any value of x, there is exactly one value for x2. Another way to say this is that if x = y, then x2 = y2. To solve the previous challenge problem, we have ...

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