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13.12.6 The `AttributesNS` Interface

This interface is a subtype of the `Attributes` interface (see section 13.12.5). All methods supported by that interface are also available on `AttributesNS` objects.

The following methods are also available:

`getValueByQName`(name)
  Return the value for a qualified name.

`getNameByQName`(name)
  Return the `(namespace, localname)` pair for a qualified name.

`getQNameByName`(name)
  Return the qualified name for a `(namespace, localname)` pair.

`getQNames`()
  Return the qualified names of all attributes.