Originally Posted by Dynamix

It's not necessarily recursive, but you can have as many "macros" in the template as you like. So for example, you have a..
Base description of:
My dog walks through the park
You could have a template that says:
My {dog-names} walks through the park
where {dog-names} could include dog, pet, puppy, doggy, bulldog, dalmation
Or you could get more intense, such as:
My {dog-names} {actions} through the park
where {actions} could include walks, trots, runs, drags me
Or:
My {dog-names} {actions} {places}
where {places} could include through the park, all around town, in my yard