XML-look-like editor for high level pseudocode?

[Stefan]

I'm looking for some sort of tool that will allow me to present high
level pseudocode in a way that looks similar to the way XML is
presented in the browser. I would like to be able to collapse and
expand blocks of code (IFs, LOOPs, Functions, etc...). It must be
relatively easy to use as it will be used by people who have
relatively minimal technical knowledge.

Is there something like this out there?

Thanks,
Stefan