Graphviz-默认子图/簇样式

目前我总是这样写子图/簇：

subgraph "cluster_001" {
    rank = TB;
    style = "filled";
    color = "#EEEEEE";
    004[label = "{<1>if\(gt \> 0\)|<2>else if\(gt == 0\)|<3>else if\(gt \< 0\)}"];
    005[label = "..."];
    006[label = "..."];
    007[label = "..."]
}

我定义了一次，然后每个箭头都是这样设计的。这将成为默认设置

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我需要一些类似的群集。。。这是怎么做到的呢？

令我惊讶的是，有一种内在的方式。将其放在群集定义之前：

graph[ rank = TB;  style = "filled";   color = "#EEEEEE";]  

像这样：

digraph d {
  a -> b
  graph[ rank = TB;  style = "filled";   color = "#EEEEEE";]
  subgraph cluster1 {
   x1 ->x2->x3
   }
     subgraph cluster2 {
   y1 ->y2->y3
   }
     subgraph cluster3 {
   z1 ->z2->z3
   }
  {rank=same e->f}
}

给予：

---

非常感谢！它就像一个符咒。

digraph d {
  a -> b
  graph[ rank = TB;  style = "filled";   color = "#EEEEEE";]
  subgraph cluster1 {
   x1 ->x2->x3
   }
     subgraph cluster2 {
   y1 ->y2->y3
   }
     subgraph cluster3 {
   z1 ->z2->z3
   }
  {rank=same e->f}
}