[plt-scheme] Best pattern for bringing external data into a program?

[Grant Rettke]

Say that you wanted to store some program data outside of the program
so it could be loaded later on. It is struts or lists.

What is the best pattern for doing this in PLT Scheme?

I have seen a few different approaches: eval, pattern matching on the
data to bring it in, and even eval'ing in a namespace.

What is the best approach?