Both the more pragmatic Topic Map data model (TMDM) and the more fundamental Topic Map Reference Model (TMRM), have reached now a certain degree of maturity. Unfortunately, the development of these models did not occur in lockstep as they address very different needs and communities. This work tries to be the missing link by faithfully mapping TMDM instances into TMRM. For this purpose we formally introduce a refinement of the existing T model by adapting it to the latest TMRM version and by extending it to cover TMRM disclosures.