How to use Nokogiri with XML namespace in Ruby

I recently wanted to fetch some data published by the ECB in XML format. Ruby + Nokogiri were very handy doing it. The tricky thing was to include the namespace in the XPath query.

	#!/usr/bin/env ruby
	require 'pp'
	require 'nokogiri'
	require 'open-uri'
	doc = Nokogiri::XML(open('http://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml'))
	cubes = doc.xpath("//ecb:Cube[@currency='CAD']",
	'ecb' => 'http://www.ecb.int/vocabulary/2002-08-01/eurofxref')
	cubes.each { |c|
	print c.attribute('currency'), "=", c.attribute('rate').value.to_f, "\n"
	}

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