Good explanation Jan, I just want to add that the named tags with double quotes and those without are parsed in different ways. When you use it without double quotes then only same named tags below the first tag are parsed, but those same named tags with double quotes are parsed for the whole page. There is a good technical explanation but I am not going to bore you with it. Suffice it to say that those without double quotes might run into problems in future upgrades as Jan pointed out. So although they appear to function the same, they don't.