How to add a resource?

What are you trying to do? Because that's a unitstat, not a resource.

Sorry I explained that horribly.  I added the stat UnitStat_EmmagineXPGiver

Now I want to have a city give xp to the units in it based on the total of that stat of the units in the city.

I don't know how to do that.

how would I add it if it were a resource from a tile?

My thought was that I could add a recourse to the city, and have the unit give a bonus to that resource.  Then have the city give a bonus to xp of units stationed in it.  I know it sounds overly complicated, but I can't find another way. 

I haven't tried anything with those functions so I don't know. There's a few buildings that give bonuses that scale with essence - I'd start there and see if you can modify the modifiers that give experience like that building.

That's a really good idea.   Is there a place to put code if I want it to always be present in every city?  Like The default stats for a cities production before constructed buildings?

In CoreImprovements.xml put them in cityhub1 and the forced choices for level 2 cities - fortress, conclave and town.

Ok.  Does the change need to go into each one? and for each level of the city? or as a city upgrades does it retain it's lower level options?

Just those I mentioned, since every city has one of those 4. No, they don't stay if the improvement gets replaced.

My next question relates more to testing than modding.  If I load a saved game after having changed my data files, will it use the old or the new data files?

The old ones, you have to restart the client and start a new game.

I really appreciate all your help heavenfall.

Okay, so this works:

<GameModifier>
<ModType>StationedUnitStatBonus</ModType>
<StrVal>UnitStat_Experience</StrVal>
<PerTurn>1</PerTurn>
<Provides>Stationed units gain 1 xp per season.</Provides>
<Value>1</Value>
</GameModifier>

This doesnt

<GameModifier>
<ModType>StationedUnitStatBonus</ModType>
<StrVal>UnitStat_Experience</StrVal>
<PerTurn>1</PerTurn>
<Provides>Stationed units gain 1 xp / essence / season.</Provides>
<Calculate InternalName="Value" ValueOwner="OwnerCity">
<Expression><![CDATA[[TileYieldEssence]]]></Expression>
</Calculate>
</GameModifier>

Shouldn't the 2nd one grant 1 xp per essence in the city? 

It looks right.

That's what I thought.  There is something wrong here with my thinking.

<GameModifier>
<ModType>StationedUnitStatBonus</ModType>
<StrVal>UnitStat_Experience</StrVal>
<PerTurn>1</PerTurn>
<Provides>+10 experience to stationed units / turn</Provides>
<Calculate InternalName="Value" ValueOwner="OwnerCity">
<Expression>10</Expression>
</Calculate>
</GameModifier>

Doesn't work.

<GameModifier>
<ModType>StationedUnitStatBonus</ModType>
<StrVal>UnitStat_Experience</StrVal>
<PerTurn>1</PerTurn>
<Provides>+10 experience to stationed units / turn</Provides>
<Value>10</Value>
</GameModifier>

 Does Work.

 

Any other attempt to calculate a number to place in the value doesn't work either.  Any ideas?

Is there a possibility the issue is with OwnerValue?   

The modifier probably just doesn't support those types of calculations.

I would have thought they would use the same subroutine to acquire values from xml, for all functions & loading them into an object, but everyone programs their own way.

I wonder if we can unlock a building with leveling up somehow..... 

Never mind, that wouldn't work either.   Ah well, perhaps this trait was not meant to be.

You should have no problems making a trait unlock a building.