Well, not exactly!From HTML 3.0 to 4.03 they added things, they did not change the models, the added, essencially, css, i think. But they did not change its business or implant new rules, they just kind'off 'updated' it.With XML they added somethings and changed others, wich don't make total sence to ME....i undesrtand their need. But with this all i wanted to ask another question. With XHTML, will the HTML pages be blocked? or just unreadble