code: protected void appendXPath(StringBuilder sb, String xpath) {
          if (xpath != null && xpath.length() > 0) {
              sb.append(" at ").append(xpath);
          }
      }
docs: Appends the XPath information for {@link #getShortString} if present.
  
  @param sb the builder to append to
  @param xpath the xpath to append, if any
  
  @since XMLUnit 2.4.0