getTagKey(keepAllAttributes) {
    if (keepAllAttributes) {
      return this.toString();
    }
    const attributesToSkip = new Set()
        .add('AUDIO')
        .add('VIDEO')
        .add('SUBTITLES')
        .add('PATHWAY-ID')
        .add('GROUP-ID')
        .add('URI');
    return this.toString(attributesToSkip);
  }
Create the string key of the tag.

@param {boolean} keepAllAttributes
@return {string}