There is a symbol reference. I want it to be unique in case there are more than one Progress Indicator on a page:
```html
<svg>
  <defs>
    <symbol id="testIndicator-symbol">
      <text/>
    </symbol>
  </defs>
  <g>
    <line/>
    ...
  </g>
  <use xlink:href="#testIndicator-symbol"/>
</svg>
```