code: String canonicalize(String rawMathML) {
          try {
              return MathMLCanUtil.canonicalize(rawMathML);
          } catch (Exception e) {
              logger.warn("mathml canonicalization failed", e);
              return rawMathML;
          }
      }
docs: Calls the {@link MathMLCanUtil}. If an exception occurs,
  a warning will be logged and the original mathml returned.
  
  @param rawMathML raw or original mathml to be normalized
  @return canonicalize / normalized mathml