package graphics_pkg is attribute graphic_symbol : string; attribute graphic_style : string; end package graphics_pkg; -- code from book library ieee; use ieee.std_logic_1164.all; library graphics; package gate_components is use graphics.graphics_pkg.graphic_symbol, graphics.graphics_pkg.graphic_style; component and2 is generic ( prop_delay : delay_length ); port ( a, b : in std_logic; y : out std_logic ); end component and2; attribute graphic_symbol of and2 : component is "and2"; attribute graphic_style of and2 : component is "color:default, weight:bold"; -- . . . end package gate_components; -- end code from book <div align="center"><br /><script type="text/javascript"><!-- google_ad_client = "pub-7293844627074885"; //468x60, Created at 07. 11. 25 google_ad_slot = "8619794253"; google_ad_width = 468; google_ad_height = 60; //--></script> <script type="text/javascript" src="http://pagead2.googlesyndication.com/pagead/show_ads.js"> </script><br /> </div>