properly handle rdf:HTML

[sballesteros]

graph-rdfa-processor works fine but currently, jsonld-rdfa-parser only get the textContent see:

import util from 'util';
import { jsdom } from 'jsdom';
import getRdfaGraph from 'graph-rdfa-processor';
import jsonld from 'jsonld';
import jsonldRdfaParser from 'jsonld-rdfa-parser';
jsonld.registerRDFParser('text/html', jsonldRdfaParser);

const html = '<span resource="http://example.com"><span property="schema:name" datatype="rdf:HTML"><em>MonkeyPatcher</em></span></span>';

let { document } = jsdom(html).defaultView.window;
let graph = getRdfaGraph(document, {baseURI: 'http://localhost'});
console.log(graph.toString());

// <http://example.com> <http://schema.org/name> """<em>MonkeyPatcher</em>"""^^<http://www.w3.org/1999/02/22-rdf-syntax-ns#HTML> .


jsonld.fromRDF(html, {format: 'text/html'}, function(err, data) {
  console.log(util.inspect(data, {depth: null}));

  //[ { '@id': 'http://example.com',
  //    'http://schema.org/name':
  //    [ { '@value': NodeList { '0': HTMLElement { item: null } },
  //        '@type': 'http://www.w3.org/1999/02/22-rdf-syntax-ns#HTML' } ] } ]

});

we should take the outerHTML