TU Braunschweig TU Braunschweig This memo presents an object-oriented data definition language for the specification of various kinds of management information. It is independent of management protocols and applications. Protocol mappings are defined as extensions to this language in separate memos. The language builds on experiences gained with the SMIv2 and its derivate SPPI. It is expected that the language presented in this memo along with its protocol mappings will replace the SMIv2 and the SPPI in the long term.