[set_function]
  name=modified_swordsman
  [do]
    [unit]
      #i want to be able to specify modifications for my swordsman in my tag, so insert a [modifications] tag here
      [insert_tag] #dun! this is no EventWML, so [insert_tag] won't be recognized!
          name=modifications
          variable=$param.modifications
      [/insert_tag]
      type=Swordsman
      ...
    [/unit]
  [/do]
[/set_function]