CHAPTER 10 Counting and Set in OWL
Restrictions provide a concise way to describe a class of individuals in terms of the properties we know that describe the individuals themselves. As we saw in the previous chapter, we can use this construct to define notions like Vegetarian (describing someone in terms of they type of food that they eat), to sift information from a table (describing something according to a value of one property), and to manage groups of people or terms (describe something based on its membership in a group). The restrictions defined in Chapter 9 are powerful methods for defining classes of individuals.
In this chapter, we see that OWL augments this capability with a full set theory language, including intersections, unions, ...
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