request <<request-name>> { type: exec; exec_task: <<exec-task-name>>; input: <name>::<sdi-ref>; output: <name>::<sdi-ref>; c_control_func: <codel>; c_exec_func_start: <codel>; c_exec_func: <codel>; c_exec_func_end: <codel>; c_exec_func_inter: <codel>; c_exec_func_fail: <codel>; fail_msg: <msg-name>, ...; incompatible_with: <exec-rqst-name>, ...; }