[josm-dev] Creating custom validation

[Morten Olsen lysgaard]

Running a child project using the OSM stack
I'd like to create custom validation rules for JOSM.
Can this be written as a plugin?

How is this done currently? Is there some sort of abstraction. So that 
you write a function that tells if an object is valid, and then JOSM 
takes care of mapping this function over all the objects that are to be 
uploaded?
Enlighten me, thanks in advance =)