NamedNodeMap interface represents a collection of
Attr objects. Objects inside a
NamedNodeMap are not in any particular order, unlike
NodeList, although they may be accessed by an index as in an array.
Attr identified by a namespace and related local name.
Attr at the given index, or
null if the index is higher or equal to the number of nodes.
Attr identified by the given namespace and related local name.
Replaces, or adds, the
Attr identified in the map by the given name.