Mine

scope_define site {
    vars {temp hum}
    configs {
	num_ws 1
	num_comp 1
	num_doser 0
	fertigation 0
	num_minders 0
	heating 0
	fogging 0
    }
}

scope_define ws {
    parent site
    bindings {temp temp hum hum}
    rules {
	read_ws {
	    outvars temp hum
	    body {
		# variable sa_args autodefined here, this is a sensor
		return [list 22 89]
	    }
	}
    }
}