@shexjs/term

RDF terms as ShEx uses them: conversions between RDF/JS terms, ShExJ's JSON-LD-style values, and Turtle lexical forms — plus the Start sentinel and the string-unescaping shared by the ShExC and ShapeMap parsers.

Install

npm install @shexjs/term

Quick start

const Term = require("@shexjs/term");
const {DataFactory} = require("n3");

// RDF/JS term → ShExJ value (an IRI is a string; a literal is an object)
Term.rdfJsTerm2Ld(DataFactory.namedNode("http://a.example/n1"));
// 'http://a.example/n1'
Term.rdfJsTerm2Ld(DataFactory.literal("chat", "fr"));
// { value: 'chat', language: 'fr' }

// … and back
Term.ld2RdfJsTerm({value: "chat", language: "fr"});
// a Literal RDF/JS term for "chat"@fr

// either form → Turtle lexical form
Term.rdfJsTerm2Turtle(DataFactory.literal("chat", "fr"));   // '"chat"@fr'
Term.shExJsTerm2Turtle("http://a.example/n1");              // '<http://a.example/n1>'

What's here

• rdfJsTerm2Ld(term) / ld2RdfJsTerm(ld) — between RDF/JS terms and the values ShExJ writes (IRI as string, _:‑prefixed blank node, literal as {value, type?, language?}).
• rdfJsTerm2Turtle(term, meta?) / shExJsTerm2Turtle(term, meta?) — render a term in Turtle, abbreviating with meta's base and prefixes when given.
• Start / isStart(x) — the sentinel a shape map uses to say "the schema's start shape": {node, shape: Start}. There is one frozen Start object; isStart also recognizes a structural clone ({term: "START"}), which is what survives a postMessage across a worker boundary.
• unescapeText(string, replacements) — the \uXXXX/\U… (and caller-supplied) escape decoding that the ShExC and ShapeMap grammars share.
• RdfLangString, XsdString — the two implicit literal datatypes.
• Terminals — regular expressions for RDF terminal productions (IRIREF, PNAME_LN, …).
• Types used across the suite: SchemaIndex, ShapeMapEntry, Meta and friends.

This package sits under everything else in the suite (the parsers, the validator, the neighborhoods), so it is versioned independently and depends on nothing else in it.

@shexjs/term is one of the shex.js packages; installing shex pulls in the whole suite, and its README maps them.