As we approach a Platform 2.0 release, we should remove the org.openmrs.arden package from core. This package is an artifact from when it was developed & used by the LogicService for CHICA and all that code was still part of core. The LogicService was migrated into a module and the dependency on it eventually dropped. The CHICA team evolved & enhanced the Arden code elsewhere. This package in core is no longer maintained and its use wouldn't be supported anyway.