Missing action attributes

[Pablete1234]

<action> has both a filter and an untrigger-filter, the second filters if untrigger events (ie: when the filter of a trigger stops matching) is passed down to children. This behavior is completely undocumented but it is essentially the same idea as lend kits, where when filter passes you give the kit, and after filter stops passing you remove the kit. Given kits are actions, this works with them too.
The default for untrigger-filter is never tho, because it was added after actions and it would be a behavior change (if you had a kit it would now remove it while prior it wouldn't have).

<switch-scope> is essentially parsed as an action, so this one also has the same filter and untrigger-filter properties, and they filter on the inner scope

example:

<actions>
  <action id="do-stuff" untrigger-filter="always" scope="player">
    <message text="Giving speed!"/>
    <kit>
      <walk-speed>1.5</walk-speed>
    </kit>
  </action>
  <trigger filter="region" action="do-stuff" scope="player"/>
</actions>

When a player enters region they're sent the text and given the kit, when leaving the region the kit is removed. If untrigger-filter isn't defined, it defaults to never, and the player would keep the kit even after leaving