@Nullable
  public static PsiFile resolveFile(String name, PsiFile baseFile) {
    if (baseFile == null) return null;

    final VirtualFile virtualFile = VfsUtilCore.findRelativeFile(name, baseFile.getVirtualFile());
    if (virtualFile != null) {
      final PsiFile file = baseFile.getManager().findFile(virtualFile);
      if (file != baseFile && file instanceof XmlFile) {
        return file;
      }
    }
    return null;
  }
@Nullable
  public static PsiFile resolveFile(String name, PsiFile baseFile)