I have been slowly working toward supporting variables that can be
declared/updated during output generation. This code also cleans up the
code for searching within a scope.
This is the first step towards supporting custom tags. There are
wrinkles I need to work out, since I'm not 100% sure what the finished
code will look like.
This is the code almost verbatim from the NList project. This project is
due for a major overhaul, but I don't know the order I will be breaking
out NList in the upcoming weeks.