Generate a YGOPro Lua script for the following Yu-Gi-Oh card effect:
Face-up Xyz Monsters with Xyz Material cannot be targeted by card effects.
--エクシーズ・ヴェール
--Xyz Veil
local s,id=GetID()
function s.initial_effect(c)
	--Activate
	local e1=Effect.CreateEffect(c)
	e1:SetType(EFFECT_TYPE_ACTIVATE)
	e1:SetCode(EVENT_FREE_CHAIN)
	c:RegisterEffect(e1)
	--untargetable
	local e2=Effect.CreateEffect(c)
	e2:SetType(EFFECT_TYPE_FIELD)
	e2:SetCode(EFFECT_CANNOT_BE_EFFECT_TARGET)
	e2:SetRange(LOCATION_SZONE)
	e2:SetProperty(EFFECT_FLAG_IGNORE_IMMUNE)
	e2:SetTargetRange(LOCATION_MZONE,LOCATION_MZONE)
	e2:SetTarget(s.etarget)
	e2:SetValue(1)
	c:RegisterEffect(e2)
end
function s.etarget(e,c)
	return c:GetOverlayCount()~=0
end