Notation3

Notation3
Filename extension .n3
Internet media type text/n3;charset=utf-8
Developed by Tim Berners-Lee
Type of format semantic web
Container for RDF data
Standard Specification

Notation3, or N3 as it is more commonly known, is a shorthand non-XML serialization of Resource Description Framework models, designed with human-readability in mind: N3 is much more compact and readable than XML RDF notation. The format is being developed by Tim Berners-Lee and others from the Semantic Web community. A formalization of the logic underlying N3 was published by Berners-Lee and others in 2008.[1]

N3 has several features that go beyond a serialization for RDF models, such as support for RDF-based rules. Turtle is a simplified, RDF-only subset of N3.

Examples

This RDF model in standard XML notation

<rdf:RDF
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:dc="http://purl.org/dc/elements/1.1/">
  <rdf:Description rdf:about="http://en.wikipedia.org/wiki/Tony_Benn">
    <dc:title>Tony Benn</dc:title>
    <dc:publisher>Wikipedia</dc:publisher>
  </rdf:Description>
</rdf:RDF>

may be written in Notation 3 like this:

 @prefix dc: <http://purl.org/dc/elements/1.1/>.
 
 <http://en.wikipedia.org/wiki/Tony_Benn>
   dc:title "Tony Benn";
   dc:publisher "Wikipedia".

(This example would also be valid Turtle.)

Comparison of Notation3, Turtle, and N-Triples

FeatureNotation3TurtleN-Triples
Character encoding UTF-8UTF-8ASCII
Directives @base
@forAll
@forSome
@keywords
@prefix
Lists
() (DAML lists)
<nowiki>{ … }</nowiki> (statement lists)
Literals true / false
(Boolean)
xsd:decimal
(decimal arbitrary length)
xsd:double
(decimal double)
xsd:integer
(decimal integer)
Syntactic sugar RDF paths
QNames
a /@a (equiv. to rdf:type )
[] (shorthand for blank node)
<nowiki>=</nowiki>> (x implies y)
<<nowiki>=</nowiki> (y implies x)
<nowiki>=</nowiki> (x is equivalent to y)
, (repeat object in list)
; (repeat subject/verb in list)

See also

References

  1. Berners-Lee, T. I. M.; Connolly, D. A. N.; Kagal, L.; Scharf, Y.; Hendler, J. I. M. (2008). "N3Logic: A logical framework for the World Wide Web". Theory and Practice of Logic Programming. 8 (3). arXiv:0711.1533. doi:10.1017/S1471068407003213.
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