[request_definition]
r = sub, dom, obj, typ, act

[policy_definition]
p = sub, dom, obj, typ, act, eft

[role_definition]
g = _, _, _

[policy_effect]
e = priority(p.eft) || deny

[matchers]
m = g(r.sub, p.sub, r.dom) && r.dom == p.dom && r.type == p.type && r.obj == p.obj && r.act == p.act