rdf_turtle.pl

Re-exported predicates

The following predicates are exported from this file while their implementation is defined in imported modules or non-module files loaded by this module.

 rdf_read_turtle(+Input, -Triples, +Options)

Read a stream or file into a set of triples or quadruples (if faced with TriG input) of the format

rdf(Subject, Predicate, Object [, Graph])

The representation is consistent with the SWI-Prolog RDF/XML and ntriples parsers. Provided options are:

base_uri(+BaseURI)

Initial base URI. Defaults to file://<file> for loading files.

anon_prefix(+Prefix)

Blank nodes are generated as <Prefix>1, <Prefix>2, etc. If Prefix is not an atom blank nodes are generated as node(1), node(2), ...

format(+Format)

One of auto (default), turtle or trig. The auto mode switches to TriG format of there is a { before the first triple. Finally, of the format is explicitly stated as turtle and the file appears to be a TriG file, a warning is printed and the data is loaded while ignoring the graphs.

resources(URIorIRI)

Officially, Turtle resources are IRIs. Quite a few applications however send URIs. By default we do URI->IRI mapping because this rarely causes errors. To force strictly conforming mode, pass iri.

prefixes(-Pairs)

Return encountered prefix declarations as a list of Alias-URI

namespaces(-Pairs)

Same as prefixes(Pairs). Compatibility to rdf_load/2.

base_used(-Base)

Base URI used for processing the data. Unified to [] if there is no base-uri.

on_error(+ErrorMode)

In warning (default), print the error and continue parsing the remainder of the file. If error, abort with an exception on the first error encountered.

error_count(-Count)

If on_error(warning) is active, this option cane be used to retrieve the number of generated errors.

Arguments:

Input

- is one of stream(Stream), atom(Atom), a http, https or file url or a filename specification as accepted by absolute_file_name/3.

 rdf_load_turtle(+Input, -Triples, +Options)

deprecated

- Use rdf_read_turtle/3

 rdf_process_turtle(+Input, :OnObject, +Options) is det

Streaming Turtle parser. The predicate rdf_process_turtle/3 processes Turtle data from Input, calling OnObject with a list of triples for every Turtle statement found in Input. OnObject is called as below, where ListOfTriples is a list of rdf(S,P,O) terms for a normal Turtle file or rdf(S,P,O,G) terms if the GRAPH keyword is used to associate a set of triples in the document with a particular graph. The Graph argument provides the default graph for storing the triples and Line is the line number where the statement started.

call(OnObject, ListOfTriples, Graph:Line)

This predicate supports the same Options as rdf_load_turtle/3.

Errors encountered are sent to print_message/2, after which the parser tries to recover and parse the remainder of the data.

See also

- This predicate is normally used by load_rdf/2 for processing RDF data.