n>
  <span class=keyword>typedef</span> <b>implementation defined</b>   <span class=identifier>index_specifier_type_list</span><span class=special>;</span>
  <span class=keyword>typedef</span> <b>implementation defined</b>   <span class=identifier>index_type_list</span><span class=special>;</span>
  <span class=keyword>typedef</span> <b>implementation defined</b>   <span class=identifier>iterator_type_list</span><span class=special>;</span>
  <span class=keyword>typedef</span> <b>implementation defined</b> 