Turtle (syntax)

Last updated

Terse RDF Triple Language
Filename extension
.ttl
Internet media type
text/turtle
Developed by Dave Beckett
Latest release
RDF 1.1 Turtle (REC)
25 February 2014
Type of format Semantic Web
Container for RDF data
Extended from N-Triples, Notation3
Extended to TriG_(syntax)
Website www.w3.org/TR/turtle/

In computing, Terse RDF Triple Language (Turtle) is a syntax and file format for expressing data in the Resource Description Framework (RDF) data model. Turtle syntax is similar to that of SPARQL, an RDF query language. It is a common data format for storing RDF data, along with N-Triples, JSON-LD and RDF/XML.

Contents

RDF represents information using semantic triples, which comprise a subject, predicate, and object. Each item in the triple is expressed as a Web URI. Turtle provides a way to group three URIs to make a triple, and provides ways to abbreviate such information, for example by factoring out common portions of URIs. For example, information about Huckleberry Finn could be expressed as:

<http://example.org/person/Mark_Twain>    <http://example.org/relation/author>    <http://example.org/books/Huckleberry_Finn> .

History

Turtle was defined by Dave Beckett as a subset of Tim Berners-Lee and Dan Connolly's Notation3 (N3) language, and a superset of the minimal N-Triples format. Unlike full N3, which has an expressive power that goes much beyond RDF, Turtle can only serialize valid RDF graphs. Turtle is an alternative to RDF/XML, the original syntax and standard for writing RDF. As opposed to RDF/XML, Turtle does not rely on XML and is generally recognized as being more readable and easier to edit manually than its XML counterpart.

SPARQL, the query language for RDF, uses a syntax similar to Turtle for expressing query patterns.

In 2011, a working group of the World Wide Web Consortium (W3C) started working on an updated version of RDF, with the intention of publishing it along with a standardised version of Turtle. This Turtle specification was published as a W3C Recommendation on 25 February 2014. [1]

A significant proportion of RDF toolkits include Turtle parsing and serializing capability. Some examples of such toolkits are Redland, RDF4J, Jena, Python's RDFLib and JavaScript's N3.js.

Example

The following example defines 3 prefixes ("rdf", "dc", and "ex"), and uses them in expressing a statement about the editorship of the RDF/XML document:

@prefixrdf:<http://www.w3.org/1999/02/22-rdf-syntax-ns#>.@prefixdc:<http://purl.org/dc/elements/1.1/>.@prefixex:<http://example.org/stuff/1.0/>.<http://www.w3.org/TR/rdf-syntax-grammar>dc:title"RDF/XML Syntax Specification (Revised)";ex:editor[ex:fullname"Dave Beckett";ex:homePage<http://purl.org/net/dajobe/>].

(Turtle examples are also valid Notation3).

The example encodes an RDF graph made of four triples, which express these facts:

Here are the triples made explicit in N-Triples notation:

<http://www.w3.org/TR/rdf-syntax-grammar><http://purl.org/dc/elements/1.1/title>"RDF/XML Syntax Specification (Revised)".<http://www.w3.org/TR/rdf-syntax-grammar><http://example.org/stuff/1.0/editor>_:bnode._:bnode<http://example.org/stuff/1.0/fullname>"Dave Beckett"._:bnode<http://example.org/stuff/1.0/homePage><http://purl.org/net/dajobe/>.

The MIME type of Turtle is text/turtle. The character encoding of Turtle content is always UTF-8. [2]

Named graphs

TriG RDF syntax extends Turtle with support for named graphs.

See also

Related Research Articles

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<span class="mw-page-title-main">Named graph</span> Extension of the RDF data model

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References

  1. ↑ "RDF 1.1 Turtle - Terse RDF Triple LanguageTurtle". World Wide Web Consortium (W3C). 25 February 2014. Retrieved 16 December 2015.
  2. ↑ "MIME Media Types: text/turtle". Internet Assigned Numbers Authority (IANA). 28 March 2011. Retrieved 27 November 2011.
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