15. Apparatus for testing a sub-ontology for safeness, the sub-ontology comprising one or more elements of a given ontology, the elements comprising one or more individuals that represent at least one person or object, one or more relationships defined between the one or more individuals, and one or more pieces of metadata representing at least one characteristic of the one or more individuals and the one or more relationships, the apparatus comprising: means for defining a first subset of the one or more relationships, the first subset comprising all sensitive relationships in the given ontology; means for defining a second subset of the one or more relationships, the second subset comprising the sub-ontology; and means for determining whether any relationship in the first subset can be inferred from any relationship in the second subset, given one or more inference rules.
15. Apparatus for testing a sub-ontology for safeness, the sub-ontology comprising one or more elements of a given ontology, the elements comprising one or more individuals that represent at least one person or object, one or more relationships defined between the one or more individuals, and one or more pieces of metadata representing at least one characteristic of the one or more individuals and the one or more relationships, the apparatus comprising: means for defining a first subset of the one or more relationships, the first subset comprising all sensitive relationships in the given ontology; means for defining a second subset of the one or more relationships, the second subset comprising the sub-ontology; and means for determining whether any relationship in the first subset can be inferred from any relationship in the second subset, given one or more inference rules. 20. The apparatus of claim 15 , wherein the first subset is defined by an external source.