template/src/transforms/include.js

import fetch from 'fetch';
let fetchUrl = fetch.fetchUrl;

export default function(dom, data) {

  var includeTags = [].slice.apply(dom.querySelectorAll('dt-include'));

  includeTags.forEach(el => {
    let src = el.getAttribute('src');
    fetchUrl(src, (err, meta, body) => {
      console.log(err, meta, body);
      el.innerHTML = body.toString();
    });
  });
  data.bibliography = bibliography;
  data.citations = citations;

}