FitNesse. UserGuide. RestfulServices.
TestHistoryXml [add child]

<TestHistory>
<Page>
<Name>FitNesse.SuiteAcceptanceTests</Name>
<PageHistoryLink>FitNesse.SuiteAcceptanceTests?pageHistory&format=xml</PageHistoryLink>
<Pass>16</Pass>
<Fail>1</Fail>
<MinDate>Tue Jun 23 14:49:49 CDT 2009</MinDate>
<MaxDate>Tue Jul 07 13:08:07 CDT 2009</MaxDate>
</Page>
...
</TestHistory>