Viagenie The current Bundle Protocol specifications define the syntax of service identifiers but do not identify how to make them interoperable. For example, there are currently no way to map a service identifier to a specific Bundle payload format for an application agent. This document proposes an application framework enabling interoperable implementations and deployments of the Bundle Protocol. It also creates a service identifier registry for the Bundle Protocol. Warning: this draft was initially done in 2012 against RFC5050 in DTNRG; some parts may need to be updated.