void (@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)); } }