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

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Set Union

Using a pattern similar to the one we used for set intersection, we can also express certain things about set unions in RDFS. In particular, we can express that A ∪ B ⊆ C. We do this by making C a common superclass of A and B, thus:

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Any instance ?x that is a member of either A or B is inferred to be also a member of C; that is,

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or

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implies

EXAMPLE All Stars

In determining the candidates for a season's All Stars, a league's rules ...

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