Prefixes and Equivalence of NSs /2

Element/attribute need not be in a namespace.

NS prefix declaration or declaration or the implicit NS recursively applies to all descendants (child elements, their children etc.), unless another declaration "remaps" the given prefix.

One NS is co-called implicit (default) NS, declared by attribute xmlns=

Default NSs are NOT applied to attributes!!!, thus attributes without an explicit prefix do not belong to any NS.