Is \begin{mplibcode} ... \end{mplibcode} analogous to ConTeXt's
\startMpcode ... \stopMPcode? If so, are there a LaTeX versions of
\startMPinclusions ... \stopMPinclusions
\startuseMPgraphic ... \stopuseMPgraphic
\startreusableMPgraphic ... \stopreusableMPgraphic
\startMPpage ... \stopMPpage
Troy