Help , html string

Hi, i'm a newbie. I have a problem :
 
i want put a string html on my ID , example :
     c [label="<a href="http://hello.blogspot.com">hello</a>"][color=red];
 
this formule not work. Please help me.
thanks
Matteo
 

Help , html string

In Graphviz, the label and URL are separate:
 
  c [label=hello URL="http://hello.blogspot.com" color=red]

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