<gauge> measures how much CPU time is takes to run its contents through the RXML parser.

Example

<gauge>
  <for variable=i from=1 to=5>
  </for>
</gauge>

<gauge>
  <for variable=i from=1 to=50>
  </for>
</gauge>

<gauge>
  <for variable=i from=1 to=500>
  </for>
</gauge>