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Shape Expressions (ShEx) [2] is a language for validating and describing RDF.

ShEx - Shape Expressions
ShexLogo.png
ParadigmData Validation
Designed byEric Prud'hommeaux, Iovka Boneva, Jose Emilio Labra Gayo, Gregg Kellogg, Shape Expressions W3C Community Group
Stable release
2.1 / November 21, 2018; 9 months ago (2018-11-21)
ScopeSemantic Web
Implementation languageJavaScript, Scala
Filename extensionsshex, sx
Websitewww.w3.org/community/shex/
Major implementations
shex.js[1], Shaclex[1]
Influenced by
Turtle, SPARQL, RelaxNG
Influenced
SHACL

It was proposed at the 2012 RDF Validation Workshop[3] as a high-level, concise language for RDF validation.

The shapes can be defined in a human-friendly compact syntax called ShExC or using any Resource Description Framework (RDF) serialization formats like JSON-LD or Turtle.

ShEx expressions can be used both to describe RDF and to automatically check the conformance of RDF data. The syntax of ShEx is similar to Turtle and SPARQL while the semantics is inspired by regular expression languages like RelaxNG.

Contents

ExampleEdit

PREFIX :       <http://example.org/>
PREFIX schema: <http://schema.org/>

:Person {
 schema:name  xsd:string   ;
 schema:knows @:Person   * ;
}

The previous example declares that nodes conforming to shape Person must have one property schema:name with a string value and zero or more properties schema:knows whose values must conform with shape Person.

ImplementationsEdit

Online playgrounds and demosEdit

ReferencesEdit

  1. ^ a b Labra Gayo, Jose Emilio; Prud'hommeaux, Eric; Boneva, Iovka; Kontokostas, Dimitris (2018). Validating RDF Data. Morgan & Claypool. p. 328. ISBN 9781681731650.
  2. ^ http://shex.io/shex-semantics-20170327/
  3. ^ https://www.w3.org/2012/12/rdf-val/

Further readingEdit

Specification
  • Prud'hommeaux, Eric; Boneva, Iovka; Labra Gayo, Jose Emilio; Kellogg, Gregg, eds. (2018). Shape Expressions Language Specification. W3C Draft Community Group Report.
  • Labra Gayo, Jose Emilio; Prud'hommeaux, Eric; Boneva, Iovka; Kontokostas, Dimitris (2018). Validating RDF Data. Morgan & Claypool.

See alsoEdit