[graphviz-interest] Borders around sub-graphs

I'm using ccomps and gvpack to sort a large pile
of data into connected subgraphs.

cat data.dot  | ccomps -x | dot | gvpack -g | neato -s -n2 -Tsvg > tree.svg

(I'm viewing with Inkscape)

This is working.

But I'd like to put a HTML-like "border" around each sub graph.

I've looked at gvpack, and  -G looks useful;

  -Gname=value
     Specifies attributes to be added to the resulting union graph. For example, this can be used to specify a graph label.

But I can't find a border (or similar) attribute for graphs;

http://www.graphviz.org/doc/info/attrs.html

Am I missing something obvious?

  BugBear
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