private static void loadKeywords(@NotNull Element element, @NotNull Set<? super String> keywords) {
    String value = element.getAttributeValue(ELEMENT_KEYWORDS);
    if (value != null) {
      StringTokenizer tokenizer = new StringTokenizer(value, SEMICOLON);
      while(tokenizer.hasMoreElements()) {
        String keyword = tokenizer.nextToken().trim();
        if (!keyword.isEmpty()) keywords.add(keyword);
      }
    }
    for (final Element e : element.getChildren(ELEMENT_KEYWORD)) {
      keywords.add(e.getAttributeValue(ATTRIBUTE_NAME));
    }
  }
private static void loadKeywords(@NotNull Element element, @NotNull Set<? super String> keywords)