@Override
  public @NotNull String getDefaultHtmlDoctype(@NotNull Project project) {
    final String doctype = getProjectResources(project).myDefaultHtmlDoctype;
    if (XmlUtil.XHTML_URI.equals(doctype)) {
      return XmlUtil.XHTML4_SCHEMA_LOCATION;
    }
    else if (HTML5_DOCTYPE_ELEMENT.equals(doctype)) {
      return Html5SchemaProvider.getHtml5SchemaLocation();
    }
    else {
      return doctype;
    }
  }
@Override
  public @NotNull String getDefaultHtmlDoctype(@NotNull Project project)