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Nokogiri is pretty darn cool, certainly far cooler than REXML. I switched UPnP to Nokogiri, and here’s a handy guide.

require 'rexml/document'

Becomes

require 'nokogiri'

REXML::Document.new

Becomes

Nokogiri::XML

Both accept String or IO objects

my_element.element['element/path']

Becomes

my_element.at 'element > path'

You can use CSS in #at

my_element.each_element 'element/path' do |sub_element|

Becomes

my_element.xpath('./xmlns:element/xmlns:path').each do |sub_element|

”.” is used to select sub-elements of this one

See also Nokogiri’s Node documentation.