@NotNull
  @Attribute("class")
  @ExtendClass(value = "com.intellij.openapi.actionSystem.ActionGroup",
    allowNonPublic = true, allowAbstract = false, allowInterface = false)
  @Convert(PluginPsiClassConverter.class)
  GenericAttributeValue<PsiClass> getClazz();
@NotNull
  @Attribute("class")
  @ExtendClass(value = "com.intellij.openapi.actionSystem.ActionGroup",
    allowNonPublic = true, allowAbstract = false, allowInterface = false)
  @Convert(PluginPsiClassConverter.class)
  GenericAttributeValue<PsiClass> getClazz()