In the build run, the external program must return the names of all traffic control elements used to implement the configuration. Each line must have the following structure:
element_type element_name tc_arguments
sch_element_name.o
and the tc module must have the name
q_element_name.so
Likewise, for a filter, the file names are cls_element_name.o and f_element_name.so
Note that the external program must return at least one element, except if operating in all mode, or if it has returned the key phrase debug_target in the configuration query.