Target the node with chaining the subgraph(s) in flowchart

[nosuke23]

While it is able to avoid name conflicts by using text, but It's hard to consider another id name. How about targeting nodes by chaining the name of the subgraph(s)?

flowchart LR

subgraph subgraph1
  node
end

subgraph subgraph2
  node
end

subgraph1.node --> subgraph2.node

result:

flowchart LR

subgraph subgraph1
  node1["node"]
end

subgraph subgraph2
  node2["node"]
end

node1 --> node2

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