VirtualFile (@NotNull String url) { String location = ((ExternalResourceManagerEx)ExternalResourceManager.getInstance()).getStdResource(url, null); assert location != null : "cannot find a standard resource for " + url; VirtualFile result = VfsUtilCore.findRelativeFile(location, null); assert result != null : "cannot find a schema file for URL: " + url + " location: " + location; return result; }