I want to make a faction weakness that provides a 10% reduction to city population growth, but I just don't know the tag I would use in the ability XML. I copied the "Rebels" weakness trait, renamed it to "Slow Growth", made the pertinent tooltips, but don't know how to create said effect, if I can at all.

It would of course be defined here in this section, with ?'s where I don't know what to put:

<GameModifier>

<ModType>Player</ModType>

<Attribute>AbilityBonus</Attribute>  ?????

<StrVal></StrVal> ?????

<Value>-10</Value>

<Provides>-10% Population Growth</Provides>

</GameModifier>

So I don't know what the StrVal needs to be, and if the Attribute section needs to be AbilityBonus, or if it needs to refer to some other category where the growth statistic modifer would otherwise be kept. I'm new at this so this is probably fairly basic, but I just can't sort it out. Any help would be much appreciated!