Method addAttribute

lib/utils/xml-stream.js:67–74

(name, value)

  }

  addAttribute(name, value) {
    if (!this.open) {
      throw new Error('Cannot write attributes to node if it is not open');
    }
    if (value !== undefined) {
      pushAttribute(this._xml, name, value);
    }
  }

  addAttributes(attrs) {
    if (!this.open) {