> This symbol is "valid" and we don't need to do anything. This symbol is "invalid" and we need to escape it. It's quite a stretch to call symbols that need to

> This symbol is "valid" and we don't need to do anything. This symbol is "invalid" and we need to escape it. It's quite a stretch to call symbols that need to be escaped “invalid”. And it's often possible to escape without discerning between “valid” and “invalid” characters. For example, in HTML you might just convert all characters into numeric entities. > It is however balls to the wall insane to say "Just use it" in general. Good thing the parent didn't say it in general.