Envelops

<..configure mathml rlbabel ..>

\Configure{[]}
   {\Configure{@math}{<.block display .>}\csname a:mathml[]\endcsname
    \CenteredFrametrue \DviMath \CenteredFramefalse
    \Tg<\a:mathml mrow\Hnewline>$$\DisplayMathtrue }
   {$$\Tg</\a:mathml mrow>\EndDviMath\csname b:mathml[]\endcsname
    <.mathml rlbabel .> }

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<..block display ..>

% \a:mathml display="block"

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<..inline display ..>

%\a:mathml display="inline"

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5.1 Envelops