distancefromspawn{dinstance=1000-2000} true

Hello i have probleme with this condition for random spawn, i think i have make bad syntaxe.

RandomZombie1:
MobType: Zombie1
Worlds: world
Chance: 1
Priority: 1
Action: replace
Conditions:
- outside true
- distancefromspawn{dinstance=1000-2000} true

And all general condition can be use an this page for random spawn or it's just for skill ?...

distancefromspawn{dinstance=1000-2000} true