Symbols used to specify different Linked Data Serializations.

Includes functions to coerce formats from clojure keywords / file
extension strings into their underlying RDF4j RDFFormat object.

Supported format keywords are:

:brf
:json
:n3
:nq
:nt
:rdf (also :owl :rdfs :xml)
:rj
:trig
:trix
:ttl

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

Functions for converting tree's of turtle-like data into Linked
Data statements (triples/quads).