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Specification AccessControl4VarsTrans
enrich AccessControl4Vars
 with
   
   
   axioms 
      policy-respects-observe :  ⊦ d ⇒ d0 → (∀ nam. usedName(nam) ∧ observe(nam, d) → observe(nam, d0));
      comment: only needed for the transitive case;
       
      policy-is-reflexive :  ⊦ d ⇒ d;
      comment: needed for observe-names lemma.;
       
end enrich