You can now leverage the 16.6-2015 release Allegro Rules Developer and Checker.
The Allegro Rules Developer and Checker allows you to develop custom fabrication and assembly rules to extend capabilities provided by Allegro PCB Designer and the Manufacturing Option. This tool provides a relational geometric verification language designed specifically for creating rules that are proprietary and custom to an original equipment manufacturer (OEM). The rules can be viewed and executed from the Allegro Constraint Manager, making it a single source for all design rules checks (DRCs) within a PCB.
There are two excellent videos that describe the details:
Allegro Relational Rules Checker: Running RAVEL Rules from Constraint Manager
Allegro Relational Rules Checker: How to Run DFM RAVEL Rules Through GUI
Please share your experiences using this technology.
Jerry “GenPart” Grzenia