XF 1.5 Conditional statements for subforum? - subforum node id not work

[dondomainer]

I try to call a subforums, but not work

i try with :

<xen:if is="{$forum.node_id} == x">

<xen:if is="{$subforum.node_id} == x"> ????

I do not find anything about subforum on conditional statements

https://xenforo.com/community/resources/conditional-statements.1604/