$input_buf          buf: a buffer
$valid_b            b: used as a boolean
$entities_cnt       cnt: count, or ammount
$log_f              f: a format for sprintf() or printf()
$article_id         id: a unique identifier
$element_idx        idx: an index
$session_ser        ser: a serialized object
$long_name_out      out: output value for the current subroutine