IBM Rational DOORS Next is a requirements management tool that provides a smarter way to define, trace, analyze, and manage requirements.
See details here: https://jazz.net/products/requirements-management-doors-next/
MDAccess for DOORS Next enables developers to easily query and update content in a DOORS Next application.
MDAccess for DOORS Next is built on top of MDAccess for OSLC.
You should be familiar with MDAccess for OSLC before exploring MDAccess for DOORS Next.
MDAccess for OSLC Overview