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From SMW-Sandbox

This Property expresses that a Property can have at most one value.

or semantically equal:

Expresses, that a Woman can have only one Husband, witch is a Man - or no husband at all.

Note: Beware that this example is culture dependent. Actually there are homosexual marriage and polygamy in different cultures.

[edit] See also

• OWL
• owl:TransitiveProperty
• owl:SymmetricProperty
• owl:FunctionalProperty
• owl:InverseFunctionalProperty