Knowledge Management definitions beginning with U

Universal restrictions are given the symbol ∀. They constrain the relationships along a given property to individuals that are members of a specific class. For example the universal restriction ∀ hasTopping MozzarellaTopping describes the individuals all of whose hasTopping relationships are to members of the class MozzarellaTopping - the individuals do not have a hasTopping relationships to individuals that aren't members of the class MozzarellaTopping.

Universal restrictions are also know as All Restrictions.

For a given property, universal restrictions do not specify the existence of a relationship. They merely state that if a relationship exists for the property then it must be to individuals that are members of a specific class.

Cody Burleson - Cite This Source - This Definition
Browse Related Terms: ABox, anonymous class, defined class, Ontology, restriction, T

URLs are the most familiar type of URI; a URI defines or specifies an entity, without necessarily by naming its location on the Web.
Semantic Alley - Cite This Source - This Definition
Browse Related Terms: DataTypeProperty, RDF, RDFS, resource, SPARQL, Typed Literal, URL (Uniform Resource Locator)

The familiar constructs such as http://www.semanticalley.com/ that are used in hyperlinks.
Semantic Alley - Cite This Source - This Definition
Browse Related Terms: DataTypeProperty, RDF, RDFS, resource, SPARQL, Typed Literal, URI (Universal Resource Identifier)

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