String (@NotNull XmlElement parentElement, final XmlFile file) { final String xmlElementNamespace = getXmlElementNamespace(parentElement); if (myNamespaceKey != null && !myEqualToParent) { final List<String> strings = getAllowedNamespaces(file); if (!strings.isEmpty() && !strings.contains(xmlElementNamespace)) { return strings.get(0); } } return xmlElementNamespace; }