@Nullable
private PsiMetaOwner retrieveOwner(final XmlFile file, final String namespace) {
if (file == null) {
return namespace.equals(XmlUtil.getTargetSchemaNsFromTag(this)) ? this : null;
}
return file.getDocument();
}
@Nullable
private static XmlNSDescriptor getDtdDescriptor(@NotNull XmlFile containingFile) {
final XmlDocument document = containingFile.getDocument();
if (document == null) {
return null;
}
final String url = XmlUtil.getDtdUri(document);
if (url == null) {
return null;
}
return document.getDefaultNSDescriptor(url, true);
}