# Group (i.e. subgraph) + Edge + Node. OK.
(cluster_1:[Solar system]->{arrowhead: diamond}[Earth]){bgcolor: cornflowerblue; label: Locale}
-> [Australia]
# Group (i.e. subgraph) + Edge + Node. OK.
(cluster_1:[Solar system]->{arrowhead: diamond}[Earth]){bgcolor: cornflowerblue; label: Locale}
-> [Australia]