code: public CompareAssert and(Object control) {
          isNotNull();
          try {
              return CompareAssert.create(actual, control, prefix2Uri, dbf);
          } catch (Exception e) {
              throwAssertionError(shouldNotHaveThrown(e));
          }
          return null; //fix compile issue
      }
docs: Create {@link CompareAssert} for given <b>control</b> XML source and actual XML source.
  
  @throws AssertionError if the actual value is {@code null}
  @throws AssertionError if the control value is {@code null}