class Nokogiri::XML::XPathContext

def register_namespaces(namespaces)
  namespaces.each do |key, value|
    key = key.to_s.gsub(/.*:/, "") # strip off 'xmlns:' or 'xml:'
    register_ns(key, value)
  end
end

def register_variables(binds)
  return if binds.nil?
  binds.each do |key, value|
    key = key.to_s
    register_variable(key, value)
  end
end