Adding promotions to buildings via events?

[civcivv]

Some events in BtS have a conclusion of "provide all current and future naval units with Combat I" and then only give your current units Combat I.

How could I change my files so that a building (e.g. Harbor) actually gives a certain promotion after an event fires?

I can see how to give commerce and yield bonuses to buildings from events, but not promotions. Is it even possible? Maybe via python if not XML?

I guess I could code it so that an event create a special building which has this ability, but that is quite a bit of hassle and would only work for existing cities, not all new cities as well...

Thanks for any pointers!

 

[zyphyr]

Have the event provide a free building in one city that does nothing but provide the free building with the promo to all cities.

 

[civcivv]

Thats the alternative, yes, but it won't apply to future cities and captured cities I believe.

 

[zyphyr]

It will apply to future citites, just like the free Monument from Stonehenge.

Event puts Building1 in one city (probably capital, but any will do)

Building1 provides a free copy of Building2 in each city.

Building2 provides a free promotion to units built in the city.