DIG 2.0 Reference Middleware

The DIG interface defines a protocol for the communication of Description Logic (DL) applications. The current DIG 1.1 specification has some shortcomings, which gave rise to the definition of its successor DIG 2.0. In this paper, we introduce the DIG 2.0 Reference Middleware. It allows for the integration of applications that comply with any of the two language versions. In addition to a language translation service, this middleware adds told and retraction functionalities to the DL reasoner when needed.