boolean (@NotNull DomFileElement<?> domFileElement, @NotNull String namespaceKey) { final VirtualFile file = domFileElement.getFile().getVirtualFile(); if (!(file instanceof VirtualFileWithId)) return false; CommonProcessors.FindFirstProcessor<PsiFile> processor = new CommonProcessors.FindFirstProcessor<>(); StubIndex.getInstance().processElements( KEY, namespaceKey, domFileElement.getFile().getProject(), GlobalSearchScope.fileScope(domFileElement.getFile()), PsiFile.class, processor ); return processor.isFound(); }