def getHTML(self):
        """
        Return a html table for this hierarchy
        """
        ret_string = ""
        for index in range(len(self.root.getList())):
            leafCells = self.leaf.getHTML()[4:]
            ret_string += "<tr><td rowspan=\"" + str(self.leaf.getSpan()) + "\">" + self.root[index] \
                             + "</td>" + leafCells
        return ret_string