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\array{
\rowopts{\align{center}}
X & \overset{\ulap{g}}{\longrightarrow} & Y \\
\downarrow \rlap{\mathop{id}} & & \llap{\alpha}{\downarrow} \\
\rowopts{\align{center}}
X & \underset{\dlap{h}}{\longrightarrow} & Z
}
\array { \mathbb{R} \\
\downarrow \rlap{\pi} \\
X
}
More information on these examples may be found in
Sec. 7.5
of the WebTeX documentation.
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