def html(string)
      ptr = Libcgraph.agstrdup_html(graph.ptr, string)
      string = ptr.read_string
      Libcgraph.agstrfree graph.ptr, ptr

      string
    end
def html(string)
      ptr = Libcgraph.agstrdup_html(graph.ptr, string)
      string = ptr.read_string
      Libcgraph.agstrfree graph.ptr, ptr

      string
    end
Creates an HTML label
 @param string [String] the HTML to parse
 @return [Object] a HTML label