[racket] Creating languages in Dr.Racket

Hi all,

For my master thesis I'm exploring the constructs available in Dr.Racket for creating languages.
Now my question is whether these different constructs or the possibility to create custom languages in racket in general are based on some kind of model?
Also, if there is in fact a model, are there any papers or some other lecture handling about this model?

Thanks in advance,

Simon

ps: I have problems with posting to the user list, so it can be that this message appears multiple times.