I can generate the summary results using the following:
sourcetype="xml" | spath output="Total" path=test-results.test-suite{1}{@time} | rename total as "Ran" | rename success as "Overall Result" | table date, time, "Ran", ignored, failures, errors, "TotalTime"
(Please ignore the namings of the headers)
As these fileds are automatically generated by Splunk (I assume from the processing of the first 5000 chars of the file - though I can't get to any Splunk Server config files).
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