docs: protected void processIncludes(Map<String, String> mergeProps, URL rootURL, String includeProps) {
          if (includeProps == null)
              return;
  
          String props[] = includeProps.trim().split("\\s*,\\s*");
          for (String pname : props) {
              mergeProperties(mergeProps, rootURL, pname);
          }
      }