Indicate that an unprefixed element and all its unprefixed descendant
elements belong to a particular namespace by attaching an xmlns
attribute with no prefix:
<DATASCHEMA xmlns="http://www.w3.org/2000/P3Pv1">
<DATA name="vehicle.make" type="text" short="Make"
category="preference" size="31"/>
<DATA name="vehicle.model" type="text" short="Model"
category="preference" size="31"/>
<DATA name="vehicle.year" type="number" short="Year"
category="preference" size="4"/>
<DATA name="vehicle.license.state." type="postal." short="State"
category="preference" size="2"/>
<DATA name="vehicle.license.number" type="text"
short="License Plate Number" category="preference" size="12"/>
</DATASCHEMA>
Both the DATASCHEMA and DATA elements are in the
http://www.w3.org/2000/P3Pv1 namespace.
Default namespaces apply only to elements, not to attributes.
Thus in the above example the name,
type, short, category, and size
attributes are not in any namespace.
Unprefixed attributes are never in any namespace.
You can change the default namespace within a particular
element by adding an xmlns attribute to the element.