code: protected static boolean locateMatchingAttributeValue(final String attrName, final String attrValue,
                                                            final Map<String, List<Object>> attributes) {
          return locateMatchingAttributeValue(attrName, attrValue, attributes, true);
      }
docs: Locate matching attribute value boolean.
  
  @param attrName   the attr name
  @param attrValue  the attr value
  @param attributes the attributes
  @return true/false