In enlighten the links were not coming up between the architecture layers i.e. UI -> BL -> DAL
Links were missing between the layers.
The reference pattern is an entity that is associated to a technology.
It would check if the regular expression is correct and permit to create links to a specific AU.
Reference pattern can be added in a dependency rule to create a desired link between object in source AU and object in Target AU.
Use To be Decided (TBD) in case you don't know about the impact.
Ticket # 1453