public static XsltChecker.LanguageLevel getXsltLanguageLevel(@NotNull PsiFile psiFile) {
    final CachedValuesManager mgr = CachedValuesManager.getManager(psiFile.getProject());
    return mgr.getParameterizedCachedValue(psiFile, FORCE_XSLT_KEY, XsltSupportProvider.INSTANCE, false, psiFile);
  }
public static XsltChecker.LanguageLevel getXsltLanguageLevel(@NotNull PsiFile psiFile)