pst-node question

[Juan Manuel Leal Garcia]

Hi everybody there:

Is there any way to do what I want to do with this picture automatically
with pst-node?

\begin{pspicture}*(0,0)(3,1.2)
\rput[lb]{0}(0,0.7){$A \stackrel{f}{\rightarrow} B
\stackrel{g}{\rightarrow} C$}
\pscurve[arrowsize=3pt,arrowlength=0.5,arrowinset=1.4,linewidth=0.4pt]{->}%

 (0.3,0.65)(1,0.5)(1.8,0.65)
\rput[b]{0}(1,0.1){\small $g \circ f$}
\end{pspicture}

Thanks in advance.

Juan Manuel
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