CMIS is a specification for improving interoperability between Enterprise Content Management systems. OASIS approved CMIS as an OASIS Specification on May 1, 2010. It proposes a data model plus a set of generic services and several HTTP-based protocol bindings for these services, including REST/Atom.
OpenKM supports CMIS through the following modules:
This is where content repositories talk directly to each other.
This is where an application that uses content is plugged-into a content repository to handle all content services.
For example, use SharePoint as a front-end and OpenKM repository as the back-end. This would address the existing SharePoint scalability issues without impacting the user experience.
This is where an application talks to many different repositories while presenting a singular interface to the user.