code: @Override
      public DiffBuilder withComparisonListeners(final ComparisonListener... comparisonListeners) {
          this.comparisonListeners.addAll(Arrays.asList(comparisonListeners));
          return this;
      }
docs: Registers listeners that are notified of each comparison.
  
  @see org.xmlunit.diff.DifferenceEngine#addComparisonListener(ComparisonListener)