Namespaces: No xmlns attributes

Namespaces are declared implicitly.

Example (note absence of attributes named xmlns):

<element xmlns="http://relaxng.org/ns/structure/1.0"
	 xmlns:foo="http://foo"
	 name="foo"
	 foo:annotation="bar">
  <empty/>
</element>

#.(STP:ELEMENT
   :LOCAL-NAME "element"
   :NAMESPACE-URI "http://relaxng.org/ns/structure/1.0"
   :ATTRIBUTES '(#.(STP:ATTRIBUTE
                    :LOCAL-NAME "name"
                    :VALUE "foo")
                 #.(STP:ATTRIBUTE
                    :LOCAL-NAME "annotation"
                    :NAMESPACE-PREFIX "foo"
                    :NAMESPACE-URI "http://foo"
                    :VALUE "bar"))
   :CHILDREN ... uninteresting child nodes elided ...)