docs: public String execute(List<String> parameterList, TestContext context) {
          if (CollectionUtils.isEmpty(parameterList) || parameterList.size() != 1) {
              throw new InvalidFunctionUsageException("Invalid function parameter usage! Expected single parameter but found: " + parameterList.size());
          }
          
          return StringEscapeUtils.escapeXml(parameterList.get(0));
      }