Support for HTML labels?

[jyuhuan]

How do I create the following graph using your library (this is from the official website of GraphViz):

digraph structs {
    node [shape=plaintext];

    struct1 [label=<<TABLE>
    <TR>
        <TD>line 1</TD>
        <TD BGCOLOR="blue"><FONT COLOR="white">line2</FONT></TD>
        <TD BGCOLOR="gray"><FONT POINT-SIZE="24.0">line3</FONT></TD>
        <TD BGCOLOR="yellow"><FONT POINT-SIZE="24.0" FACE="ambrosia">line4</FONT></TD>
        <TD>
          <TABLE CELLPADDING="0" BORDER="0" CELLSPACING="0">
          <TR>
            <TD><FONT COLOR="green">Mixed</FONT></TD>
            <TD><FONT COLOR="red">fonts</FONT></TD>
          </TR>
          </TABLE>
        </TD>
    </TR>
    </TABLE>>];
}

[xflr6]

It translates pretty much directly (support for HTML-labels was added in #6):

from graphviz import Digraph

g = Digraph('structs', node_attr={'shape': 'plaintext'})

g.node('struct1', label='''<
<TABLE>
  <TR>
    <TD>line 1</TD>
    <TD BGCOLOR="blue"><FONT COLOR="white">line2</FONT></TD>
    <TD BGCOLOR="gray"><FONT POINT-SIZE="24.0">line3</FONT></TD>
    <TD BGCOLOR="yellow"><FONT POINT-SIZE="24.0" FACE="ambrosia">line4</FONT></TD>
    <TD>
      <TABLE CELLPADDING="0" BORDER="0" CELLSPACING="0">
        <TR>
          <TD><FONT COLOR="green">Mixed</FONT></TD>
          <TD><FONT COLOR="red">fonts</FONT></TD>
        </TR>
      </TABLE>
    </TD>
  </TR>
</TABLE>>''')

g.view()

Another more complex exampe from the Graphviz docs is in tests/test_dot.py.