code: 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);
          }
      }
docs: Process included/referenced bootstrap properties. Properties resources
  should be specified using a) relative path from the containing
  bootstrap.properties,
  b) absolute path, or c) full URI/URLs.
  
  @param mergeProps
  @param includeProps