When attempting to explore the metadata for a process programatically it is useful to have access to the subprocess name referenced by a ProcessState node without having to have a stateful instance of the process containing the node. I understand why the ProcessDefinition cannot be provided (late binding, versioning etc.), but we are generating a process definition graph in a UI display and we need to be able to identify the referenced subprocess so that we can provide a link to its definition (which we will resolve ourselves).