The document discusses the Content Management Interoperability Services (CMIS) standard and how it addresses interoperability between content management systems. It describes three main use cases for CMIS: 1) allowing content repositories to interface with each other directly, 2) enabling applications to interface with content repositories, and 3) facilitating federated searching across multiple repositories. Each use case is explained in 1-2 sentences with examples provided. The document concludes by providing additional resources for learning more about CMIS.