Conclusions

Data macros are a useful general technique and are very useful when creating readable data DSL's i.e. systems meta-data

Lots of projects are doing this. You probably will too.

A combination of Spec conform and native Clojure seems to be the simplest way to expand data. It supports recursion natively and works well for vector -> map transformations which seems to be how most terse DSLs are being built.

Comments welcome at the Clojure Google group in this thread

This presentation can be found at http://tiny.cc/data-macros