stuff: nl_list | un_list | tl_list | utl_list | items
nl_list: m{<nl>} stuff m{</nl>} { "<list type='numbered'>$item{stuff}</list>" }
... ditto for the other three lists
items: item(s) { join "", @{$item[1]} }
item: /\w+/ { "<listitem>$item[1]</listitem>" }