grafter.rdf4j.io — grafter 0.11.0.2-drafter-rdf4j

Functions & Protocols for serializing Grafter Statements to (and from) any Linked Data format supported by RDF4j.

backend-literal->grafter-type clj multimethod

A multimethod to convert a backend RDF literal into a corresponding Clojure type. This method can be extended to provide custom conversions. You should typically not need to call this directly, instead see backend-quad->grafter-quad.

backend-quad->grafter-quad clj

(backend-quad->grafter-quad st)

Convert an RDF4j backend quad into a grafter Quad.

default-prefixes clj

A default set of common prefixes

IRDF4jConverter clj protocol

->backend-type clj

(->backend-type this)

Convert an arbitrary statement type into an RDF4j Statement type

quad->backend-quad clj

(quad->backend-quad is)

Convert a grafter IStatement into a backend (RDF4j) statement type.

rdf-writer clj

(rdf-writer destination
            &
            {:keys [append format encoding prefixes]
             :or {append false encoding "UTF-8" prefixes default-prefixes}})

Coerces destination into an java.io.Writer using clojure.java.io/writer and returns an RDFWriter.

Use this to capture the intention to write to a location in a specific RDF format, e.g.

(grafter.rdf/add (rdf-writer "/tmp/foo.nt" :format :nt) quads)

Accepts also the following optional options:

• :append If set to true it will append new values to the end of the file destination (default: false).

• :format If a String or a File are provided the format parameter can be optional (in which case it will be infered from the file extension). This should be a clojure keyword representing the format extension e.g. :nt.

• :encoding The character encoding to be used (default: UTF-8)

• :prefixes A map of RDF prefix names to URI prefixes.

ToRDF4JURI clj protocol

->rdf4j-uri clj

(->rdf4j-uri this)

Coerce an object into a sesame URIImpl