Content Management Interoperability Services (CMIS) is an interoperability standard supported by OASIS. It allows content stored in different vendors' repositories to be accessed, viewed, and in some cases, modified.
CMIS was approved in 2010 and has been endorsed by a number of major enterprise content management (ECM) providers. The biggest use case for CMIS is that it allows content stored in one repository to be accessed from another. Documents that users can view in an enterprise social network (ESN) could actually be stored in the ECM platform of record if CMIS is deployed between the two applications.