Pig men spawners in the nether

I think that if blazes get to have a spawner that so should pig men and those little wither skeletons thing ( sorry ) 

So this is my thought 

: its like finding a normal spawner  , like a zombie spawner , but !

In the nether 

So one way to find one is to explore the nether , another would be find a map in the chests of a nether fortress , it would have a marker for what kind of spawner that it is .

. just a thought , it would make awesome pigmen farm's , same with those skeleton thing's ( sorry )