code: function renderNode(node, children = []) {
      [...children].forEach(child => {
          if (child && child.tag) {
              node.ele(child.tag, child.props);
              renderNode(node, child.children);
              node.end();
          } else {
              node.text(child);
          }
      });
  }
docs: Recursively turns jsx children into xml nodes
  @param {Array} children
  @param {XMLNode} node