Nodes module for commutative diagrams etc

["Weber, Matthias" <matweber@indiana.edu>]

Dear list,

I need to typeset a handful of simple commutative diagrams like the one below, and I found the nodes manual by Alan that has exactly what I want.

But what is the incantation to load the module, or am I missing something else?

Thanks,

Matthias

\starttext 
\startMPcode
path p ; 
p := fullsquare scaled 3cm ;
nodepath = p ;
draw node(0,"\node{$G(X)$}") ;
draw node(1,"\node{$G(Y)$}") ;
draw node(2,"\node{$F(Y)$}") ;
draw node(3,"\node{$F(X)$}") ;
drawarrow fromto.bot(0,0,1, "\nodeSmall{$G(f)$}") ; drawarrow fromto.top(0,3,2, "\nodeSmall{$F(f)$}") ; drawarrow fromto.rt (0,2,1, "\nodeSmall{$η_Y$}") ; drawarrow fromto.lft(0,3,0, "\nodeSmall{$η_X$}") ;
\stopMPcode
\stoptext
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