The Common Data Model (CDM) is a standard and extensible collection of schemas (entities, attributes, relationships) that represents business concepts and activities with well-defined semantics, to facilitate data interoperability.
The Common Data Model, that was announced at Ignite, as part of the Open Data Initiative, a jointly-developed vision by Microsoft, Adobe and SAP. CDM is already supported in the Common Data Service, Dynamics 365, PowerApps, Power BI, and upcoming Azure data services. This data is continually developing at Microsoft. I do wonder what consistency there will be between the Microsoft Common Data Model and the Splunk Common Information Model.