get_attribute_ns (REXML::Attributes)

    # File temp/element.rb, line 1231
        def get_attribute_ns(namespace, name)
          result = nil
          each_attribute() { |attribute|
            if name == attribute.name &&
              namespace == attribute.namespace()
              # foo will match xmlns:foo, but only if foo isn't also an attribute
              result = attribute if !result or !namespace.empty? or
                                    !attribute.fully_expanded_name.index(':')
            end
          }
          result
        end