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Nah it's not going to work, instance is 'wppObject' not XML. Have to do it the hard way:

 

function getPriorActivityByType(activityType) {
  for each (var priorActivity in instance.activities[activityType]) {
    for each (var transition in priorActivity.transitions) {
      if (transition.target === activity.name) return priorActivity;
    }
  }
}

var priorActivity = getPriorActivityByType('query');
if (priorActivity) logInfo(priorActivity.schema);