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Triples consist of the following three terms:
Alias:Local, where Alias and Local are atoms. Each abbreviated IRI is expanded by the system to a full IRI.
Datatype IRI Prolog term xsd:float float xsd:double float xsd:decimal float (1) xsd:integer integer XSD integer sub-types integer xsd:boolean
xsd:gDay integer xsd:gMonth integer xsd:gMonthDay
xsd:gYear integer xsd:gYearMonth
(1) The current implementation of
xsd:decimal values as
floats is formally incorrect. Future versions of SWI-Prolog may
introduce decimal as a subtype of rational.
(2) SS fields denote the number of seconds. This can either be an integer or a float.
date_time structure can have a 7th field that
denotes the timezone offset in seconds as an integer.
In addition, a ground object value is translated into a properly typed RDF literal using rdf_canonical_literal/2.
There is a fine distinction in how duplicate statements are handled in rdf/[3,4]: backtracking over rdf/3 will never return duplicate triples that appear in multiple graphs. rdf/4 will return such duplicate triples, because their graph term differs.
|S||is the subject term. It is either a blank node or IRI.|
|P||is the predicate term. It is always an IRI.|
|O||is the object term. It is either a
literal, a blank node or IRI (except for |
|G||is the graph term. It is always an IRI.|
|Source||is a term Graph:Line. If Source is instatiated, passing an atom is the same as passing Atom:_.|