Adds a sequence of statements to the specified datasink.  Supports
all the same targets as add-statement.

Takes an optional string/URI to use as a graph.

Depending on the target, this function will also write any prefixes
associated with the rdf-writer to the target.

Returns target.

Adds a collection of statements to a repository in batches. The batch size is optional and default-batch-size
will be used if not specified. Some repository implementations cache added statements in memory until explicitly
flushed which can cause out-of-memory errors if a large number of statements are added through add. Spliting the
input sequence into batches limits the number of cached statements and therefore can reduce memory pressure.

Add an RDF statement to the target datasink.  Datasinks must
implement `grafter.rdf.protocols/ITripleWriteable`.

Datasinks include RDF4j RDF repositories, connections and anything
built by rdf-writer.

Takes an optional string/URI to use as a graph.

Predicate function that tests whether the supplied value is
considered to be a blank node type.

Return the RDF context from a statement.

Returns the RDF literals datatype URI as a java.net.URI.

Deletes a sequence of statements from the specified repository.

Takes an optional string/URI to use as a graph.

Returns target.

Deletes a collection of statements from a repository in batches. The batch size is optional and default-batch-size
will be used if not specified.

Return the strings language tag (as a clojure Keyword)

Create an RDF langauge string out of a value string and a given
language tag.  Language tags should be keywords representing the
country code, e.g.

(language "Bonsoir" :fr)

You can use this to declare an RDF typed literal value along with
its URI.  Note that there are implicit coercions already defined for
many core clojure/java datatypes, so for common datatypes you
shounld't need this.

Return the RDF object from a statement.

Return the RDF predicate from a statement.

Returns the naked value of a literal.  For native primitive
values e.g. a java.lang.Integer, this will return the supplied
value (like identity).  However for more complex types such as
LangString's it will coerce the value into a more natural
primitive type.

Attempts to coerce an arbitrary source of RDF statements into a
sequence of grafter Statements.

If the source is a quad store quads from all the named graphs will
be returned.  Any triples in an unnamed graph will be ignored.

Takes optional parameters which may be used depending on the
context e.g. specifiying the format of the source triples.

The `:format` option is supplied by the wrapping function and may be
nil, or act as an indicator about the format of the triples to read.
Implementers can choose whether or not to ignore or require the
format parameter.

The `:buffer-size` option can be used to configure the buffer size
at which statements are parsed from an RDF stream.  Its default
value of 32 was found to work well in practice, and also aligns with
chunk size of Clojure's lazy sequences.

The `:base-uri` option can be supplied to automatically re`@base`
URI's on a new prefix when reading.

Return the RDF subject from a statement.

Equality test for an RDF triple or quad, that checks whether the supplied RDF
statements are equal in terms of RDFs semantics i.e. two quads will be equal
regardless of their graph/context providing their subject, predicate and
objects are equal.

Like clojure.core/= this function can be applied to any number of statements.

Predicate function to test if object is a valid RDF triple.