A DSL for processing Web Service Results

My latest project included the requirement to process web service results in a generic way. I thought to myself... This is a job for Groovy Script!

But it became somewhat troublesome as these scripts would be written by non engineers, and it also opened up some security risks.

So, now the question remains, how would I then secure these results processing scripts, while also making them easier to write from 'services' types of folks?

in reference to: A Domain-Specific Language for unit manipulations | Groovy Zone (view on Google Sidewiki)