Method add

src/xmlparser/xmlNode.js:17–21

(key, val)

    this[":@"] = Object.create(null); //attributes map
  }
  add(key, val) {
    // this.child.push( {name : key, val: val, isCdata: isCdata });
    if (key === "__proto__") key = "#__proto__";
    this.child.push({ [key]: val });
  }
  addChild(node, startIndex) {
    if (node.tagname === "__proto__") node.tagname = "#__proto__";
    if (node[":@"] && Object.keys(node[":@"]).length > 0) {