This standard provides the specification of the Common Distributed Application Protocol (CDAP). CDAP enables distributed applications to deal with communications at an object level, rather than forcing applications to explicitly deal with serialization and input/output operations. CDAP provides the application protocol component of a Distributed Application Facility (DAF).[3] CDAP provides a straightforward and unifying approach to sharing data over a network without having to create specialized protocols. This standard describes the following: an overview of CDAP; the specification of CDAP; a description of policies, in the specific sense introduced in the text; and some notes on CDAP context. Annex: Google Protocol Buffers (GPB) concrete syntax. Annex: JSON concrete syntax.