A pairing between a SPARQL variable and an RDF term. In practical terms, it’s a variable that has had a value assigned.
See blank node.
A subject or object in an RDF graph that has no identity. These
are typically used to group together other values. For example, an
address book entry may have an email address of “email@example.com”,
a phone number of 943-234-9664, and an address whose value is a blank
node that has its own values: one for a street address, one for a city
name, one for a postal code, and so forth. The resource that has these
property values is represented by a prefixed name with an underscore
prefix (for example,
_:xyz) or as a pair of square braces
To convert a piece of data from one datatype to another—for example, converting the string “123” to the integer 123 or “2011-10-14T13:19:00”^^xsd:dateTime to “2011-10-14T13:19:00”^^xsd:string. “Cast” is a common programming term and not specific to SPARQL.
The triples in an RDF dataset that don’t belong to a named graph.
A popular vocabulary providing a basic set of metadata terms
specialized metadata vocabularies are usually based on Dublin
See Also vocabulary.
See SPARQL endpoint.
If A entails B, and A is true, then we know that B is true. If A is a complicated set of facts, it can be very handy to have technology such as an RDFS- or OWL-aware SPARQL processor to help ...