in $_[0] we have 
----------------

<query> SELECT * FROM threads WHERE threadid="1"</query>
<mask>
  <h2>[hlink action="show_section" 
          sectionid="<d>sectionid</d>"
     ][db_get]sections.sectionid="<d>sectionid</d>".display_name[/db_get][/hlink] > 
  <d>title</d></h2><hr/>
</mask>