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$\forall$\=$A$, $B$:Type, $f$:($A$$\rightarrow$($B$ + Top)), ${\it ds}$:(Id$\rightarrow$Type), ${\it da}$:(Id$\rightarrow$Knd$\rightarrow$Type), $X$:Interface(${\it ds}$;${\it da}$;$A$),\+
\\[0ex]${\it es}$:ES.
\-\\[0ex]es{-}decl(${\it es}$;${\it ds}$;${\it da}$) $\Rightarrow$ ([[interface{-}compose($f$;$X$)]] = $f$ o [[$X$]]   $\in$ AbsInterface($B$))
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