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
that serialize triples do not have to save the prefixed name, as long
as any new ones maintain all the same connections.
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 collection of graphs that a given SPARQL query is querying. This collection consists of a default graph and optional named graphs.
The triples in an RDF dataset that don’t belong to a named graph.
A popular standard vocabulary providing a basic set of
metadata terms such as
creator, and ...