编辑“模组创作教程”（章节）

=== Scopes ===
{{Main|Scopes}}

Let us analyse scope operators used.
<pre>create_fleet = {
	effect = {
		set_owner = prev
		create_ship = {
			random_existing_design = science
			graphical_culture = owner
		}
		set_location = {
			target = owner.capital_scope.solar_system.starbase
		}
		assign_leader = last_created_leader
	}
}</pre>

In the code <code>create_fleet</code> is called directly in <code>country_event = { immediate = {</code>. This means <code>THIS</code> scope of the effect will refer to the country event was fired for.
 root = country
 this = country
Inside <code>create_fleet</code> effect we call a series of effects using '''<code>effect block</code>'''. Now, inside effect block, <code>THIS</code> scope operator will refer to this fleet (because it was called inside THIS fleet).

 root = country
 this = fleet
 prev = country

Note how we can switch back to previous scope by using <code>PREV</code> scope operator.
<pre>effect = {
	set_owner = prev</pre>
Effect <code>set_owner</code> is called inside <code>THIS</code> fleet and targets <code>PREV</code>, which is country.