Adds a new attribute. If an attribute with that local name and that namespace
URI is already present in the element, it is replaced by the new one. Replacing
an attribute node by itself has no effect.
Per the XML Namespaces specification, applications must use the value null
as the namespaceURI parameter for methods if they wish to have no namespace.
Adds a new attribute. If an attribute with that local name and that namespace URI is already present in the element, it is replaced by the new one. Replacing an attribute node by itself has no effect. Per the XML Namespaces specification, applications must use the value null as the namespaceURI parameter for methods if they wish to have no namespace.