[Maxima] broken (?) plot2d

[Robert Dodier]

On 5/6/07, Fabrizio Caruso <caruso at dm.unipi.it> wrote:

> load(sarag);
> drawTopology(topology(x^2+y^2-1,x,y)[2]);
>
> should draw the topology of
> a circle and the expected drawing (topology)
> should look like a rombus
> (which is topologically equivalent to a circle).

When the plot format is gnuplot, I get a figure that looks like:
 /|\
 -+-
 \|/
I'm guessing this is expected.

When the plot format is openmath (in XMaxima), the plot is empty.
Did plot2d([discrete, ...]) previously work w/ openmath?

Robert