Return the base URL of this RDF, if any.

Return the prefix mappings defined for this RDF, if any.

Return an RDF with the specified prefix mappings merged with the existing mappings. If the Bool arg is True, then a new mapping for an existing prefix will replace the old mapping; otherwise, the new mapping is ignored.

Return an empty RDF.

Return a RDF containing all the given triples. Handling of duplicates in the input depend on the particular RDF implementation.

Adds a triple to an RDF graph.

Removes all occurrences of a triple in an RDF graph.

Return all triples in the RDF, as a list.

Note that this function returns a list of triples in the RDF as they were added, without removing duplicates and without expanding namespaces.

Return unique triples in the RDF, as a list.

This function performs namespace expansion and removal of duplicates.

Select the triples in the RDF that match the given selectors.

The three NodeSelector parameters are optional functions that match the respective subject, predicate, and object of a triple. The triples returned are those in the given graph for which the first selector returns true when called on the subject, the second selector returns true when called on the predicate, and the third selector returns true when called on the ojbect. A Nothing parameter is equivalent to a function that always returns true for the appropriate node; but implementations may be able to much more efficiently answer a select that involves a Nothing parameter rather than an (id True) parameter.

The following call illustrates the use of select, and would result in the selection of all and only the triples that have a blank node as subject and a literal node as object:

select gr (Just isBNode) Nothing (Just isLNode)

Note: this function may be very slow; see the documentation for the particular RDF implementation for more information.

Return the triples in the RDF that match the given pattern, where the pattern (3 Maybe Node parameters) is interpreted as a triple pattern.

The Maybe Node params are interpreted as the subject, predicate, and object of a triple, respectively. Just n is true iff the triple has a node equal to n in the appropriate location; Nothing is always true, regardless of the node in the appropriate location.

For example, query rdf (Just n1) Nothing (Just n2) would return all and only the triples that have n1 as subject and n2 as object, regardless of the predicate of the triple.

pretty prints the RDF graph

Parse RDF from the given text, yielding a failure with error message or the resultant RDF.

Parse RDF from the local file with the given path, yielding a failure with error message or the resultant RDF in the IO monad.

Parse RDF from the remote file with the given HTTP URL (https is not supported), yielding a failure with error message or the resultant graph in the IO monad.

Write the RDF to a file handle using whatever configuration is specified by the first argument.

Write the RDF to stdout; equivalent to hWriteRdf stdout.

Write to the file handle whatever header information is required based on the output format. For example, if serializing to Turtle, this method would write the necessary @prefix declarations and possibly a @baseUrl declaration, whereas for NTriples, there is no header section at all, so this would be a no-op.

Write header information to stdout; equivalent to hWriteRdf stdout.

Write some triples to a file handle using whatever configuration is specified by the first argument.

WARNING: if the serialization format has header-level information that should be output (e.g., @prefix declarations for Turtle), then you should use hWriteG instead of this method unless you're sure this is safe to use, since otherwise the resultant document will be missing the header information and will not be valid.

Write some triples to stdout; equivalent to hWriteTs stdout.

Write a single triple to the file handle using whatever configuration is specified by the first argument. The same WARNING applies as to hWriteTs.

Write a single triple to stdout; equivalent to hWriteT stdout.

Write a single node to the file handle using whatever configuration is specified by the first argument. The same WARNING applies as to hWriteTs.

Write a single node to sdout; equivalent to hWriteN stdout.