You will not find a career only using XML. XML on it's own doesn't do much.There are geneally 4 paths you can take as a web designer/programmer.You can go with windows technologies (ASP/ASp.net, SQL Server)You can go open source (Php, MySql)You can go Sun (JSP,MySQl, oracle)Or you can go desktop only (C++, .Net, JAVA)I would recommend either ASP.Net/SQL Server or PHP/MySql and learn XHTML, CSS, JavaSCript and XML and you should be set for life