It's a fine use of XML. JSON would be a kludge. The templates look like this:

    <lockup>
      <img src="${this.BASEURL}resources/images/music/music_570_e1.lcr" width="450" height="450" />
      <title class="showTextOnHighlight">Title 1</title>
    </lockup>

I wonder if they're being processed as ES6 Template Strings?