@Nullable
  public static XmlFile findSchema(@NotNull @NonNls String namespace, @NotNull PsiFile baseFile) {
    final Module module = ModuleUtilCore.findModuleForPsiElement(baseFile);
    return findSchema(namespace, module, baseFile);
  }
@Nullable
  public static XmlFile findSchema(@NotNull @NonNls String namespace, @NotNull PsiFile baseFile)