Markdown-LD

Markdown-LD is a simple syntax for humans to write RDF Linked Data in Markdown. It is a kind of literate programming for Turtle/TriG, and useful to publish and maintain linked data along with documentation.

Playground

Try it online! https://ozekik.github.io/markdown-ld/

Specification and Examples

See SPEC.md, which is compiled into SPEC.ttl (Turtle) and SPEC.json (JSON-LD).

For a more realistic example from the FOAF (Friend of a Friend) Vocabulary, see examples/foaf.md, examples/foaf.ttl (Turtle), and examples/foaf.json (JSON-LD).

Markdown-LD Compiler

A referential compiler to Turtle and other RDF formats is implemented as a unified/remark plugin and CLI.

Currently Turtle (default) and JSON-LD (with @frogcat/ttl2jsonld) are built-in formats for the output. You can supply a Turtle output to N3.js, graphy.js, and other libraries to translate it to other formats.

CLI

Installation:

npm install -g markdownld

Usage:

markdownld input.md -o output.ttl
markdownld input.md -o output.json --setting 'format: "jsonld"'

For more information, see unifiedjs/unified-args, on which Markdown-LD CLI is built.

Module

Installation:

npm install markdownld --save

Usage:

const unified = require('unified');
const markdown = require('remark-parse');
const markdownld = require('markdownld');

const input =
  '# Example\n\n`<http://example.com/>`\n\n' +
  '## Alice\n\n`<#Alice>`\n\n' +
  '### Knows\n\n`foaf:knows`\n\n' +
  '* Bob `<#Bob>`\n';

const processor = unified().use(markdown).use(markdownld);

processor.process(input, (err, { contents }) => {
  console.log(contents);  // <#Alice> foaf:knows <#Bob> .
});

Todo

• Publish playground
• Make TriG default
• Do input validation for better exception messages
• Support compilation to more RDF formats