Question for reform unit mechanism

I'm reading the EBBS.script and the EDB to study the eb reform mechanism. Thanks for eb team, i learned a lot. I understood the reform trigger mechanism in ebbs.script. But i have some problems about the EDB.

The question is: In EDB, there are not specialized MIC entries for carthage, Saka and AS reformed unit. The MIC of these factions can recurit new units, as well as the old units. And the entry of the reformed unit is not different from the old units.
For example, in carthage MIC,
the elite african infantry(reformed unit) entry: recruit "carthaginian infantry dorkim afrikanim aloophim" 0 requires factions { egypt, } and hidden_resource SW and hidden_resource A and hidden_resource y1 and hidden_resource y2 and hidden_resource y4 and hidden_resource n8
the sacred band cavalry ( not reformed unit) entry: recruit "carthaginian cavalry ezrahim parashim feeniki" 0 requires factions { egypt, } and hidden_resource SW and hidden_resource A and hidden_resource y1 and hidden_resource y2 and hidden_resource y4 and hidden_resource n8
I can only find the factional and the regional requirments, i can't find the indicator to different the reformed unit in the EDB. So i wonder how the mechanism works and what's the factor in the EDB to make the reformed unit disabled before reforms and enabled after reforms.

Any help? Thanks in advance.

I'm not sure if this has anything to do with it, but those style reformed units all have "siege" as their weapon type and in fact their weapons cannot be upgraded at the armory.

Thanks for reply, guys. yep, this is a difference.
In EDB, some special buildings are placed after the reforms, such as saka(for saka reform), carthage1( for carthage reform), cataphract(for AS reform). And these buildings have weapon_siege capability.
But i can't find the relation between the reformed units and the special reform buildings in EDB. So I wonder how the reformed units related to the special reform buildings in EDB.