Comment 2 for bug 170736

I've written something similar to this as a plugin for
Skencil called SketchLaTeX
(http://www.2pi.info/latex/sketchlatex/), and there is
another one for Skencil, called skLaTeX
(http://home.comcast.net/~jbiddier/sklatex/). For both of
those plugins, you can enter the latex text in a dialog, and
it generates the beziers from it using latex, dvips and
pstoedit. Then they can later be editied, and the processes
repeated to regenerate the display. It works very well -
much nicer than psfrag - , and the code to implement it in
Skencil is pretty basic.

However, development on Skencil has been slow lately so I've
just started looking to see if there is a plugin
architecture in Inkscape that would allow something similar.
 From what I've seen of extensions so far, there hasn't been
anything easy I can base it on. What I'd like to know about
though is if there is an example of some plugin that does
the following types of things.

- creates a new object that can be later modified as an
object (including after being saved and opened again)
- accepts user input for parameters that can later be changed
- run an external program when an update is made
- import an external file to replace the current object curves

Once those things can be done, having a latex object is
fairly trivial. I'd appreciate if someone could point to
where to look for examples of extensions that do these
things under inkscape.