public abstract String getAttributeNS (String namespaceURI, String localName) throws DOMException

Retrieves an attribute value by local name and namespace URI.
Per [XML Namespaces] , applications must use the value null as the namespaceURI parameter for methods if they wish to have no namespace.

namespaceURI    The namespace URI of the attribute to retrieve.
localName    The local name of the attribute to retrieve.

Returns:  The Attr value as a string, or the empty string if that attribute does not have a specified or default value.

DOMException     NOT_SUPPORTED_ERR: May be raised if the implementation does not support the feature "XML" and the language exposed through the Document does not support XML Namespaces (such as [HTML 4.01]).

Since:  DOM Level 2