graphviz-java/src/main/java/guru/nidi/graphviz/attribute/Label.java
public static Label html(String value) {
        return new Label(value, true, false, false, false, null, null);
    }
public static Label html(String value) {
        return new Label(value, true, false, false, false, null, null);
    }
Create a HTML label.

@param value the HTML code
@return the Label
@see <a href="http://www.graphviz.org/doc/info/shapes.html#html">www.graphviz.org</a>