final Map<String, Long> newRefs = new HashMap<String, Long>();
String result;
try {
result = urlTraverser.traverse(content, new HtmlTagAttributeVisitor() {
public String visit(String value, RenderContext context, Resource resource) {
if (StringUtils.isNotEmpty(value)) {
try {
value = replaceRefsByPlaceholders(value, newRefs, refs, node.getSession().getWorkspace().getName());
} catch (RepositoryException e) {