def render_app(zip)
      content = ::Caracal::Renderers::AppRenderer.render(self)

      zip.put_next_entry('docProps/app.xml')
      zip.write(content)
    end
def render_app(zip)
      content = ::Caracal::Renderers::AppRenderer.render(self)

      zip.put_next_entry('docProps/app.xml')
      zip.write(content)
    end
============ RENDERERS ===============================