bgcolor fontcolor fontname fontsize label margin nodesep rankdir ranksep ratio size bgcolor color fillcolor fontcolor fontname fontsize label labeljust labelloc style color fillcolor fixedsize fontcolor fontname fontsize height shape style URL width color fillcolor fontcolor fontname fontsize height style URL width arrowhead arrowsize arrowtail constraint color decorate dir fontcolor fontname fontsize headlabel headport label labeldistance labelfloat labelfontcolor labelfontname labelfontsize minlen samehead sametail style taillabel tailport URL digraph g {compound="true"; } <dot-filename></dot-filename> subgraph sub_graph_{rank="";} subgraph cluster_{ } node[label=" ", ] {}; edge[ lhead="cluster_ ",ltail="cluster_ "] struct: -> struct: ; node[shape="record",label="", ]{struct}; {} | <> | ="" =""