The MaJorToM project was founded with the goal of implementing a light-weight, merging and flexible Topic Maps engine satisfying the different business use cases. Current Topic Maps engines cannot satisfy the whole spectrum of requirements, like a listening of information streams or the guarantee of a complete chain of evidence. To realize that MaJorToM provide an extended interface to access the additional features and information resources stored by the underlying Topic Maps store. The interface definition based on the Topic Maps API (TMAPI) version 2.0.2 to enable a downward compatibility to all applications based on it and minimize the migration step.