Not sure if this has been mentioned before, but in case someone find a use for it...

A unit can have more than one building requirement, just like buldings:
If build req. is:
"{ROYAL_COURT}"

By editing that to:
"{{ROYAL_COURT},{SWORDSMITH}}"

you can get the unit either by bulding a ROYAL_COURT or a SWORDSMITH.



Could be useful for something...