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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 integer sub-types||integer|
(1) The current implementation of
xsd:decimalvalues 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_timestructure 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.|