Defines a set of custom columns to be used by tasks which take a <columns/> element, such as historical charts, JSON report, and HTML current report.
<clover-columns id="my.columns"> <totalChildren/> <avgMethodComplexity/> <totalPercentageCovered format="bar"/> </clover-columns>
<clover-report> <current> <columns refid="my.columns"/> </current> </clover-report>