munging SVG seatmaps

seatmap_munger.rb

require 'nokogiri'
class ProcessSvgVenueMap
  def initialize(file)
    @file = file
    @doc=Nokogiri::XML.parse(@file)
  end

  def remove_css
    @doc.search("svg", "defs").remove
    background_image = @doc.xpath('//@style')
    p "The background image you need is here #{background_image.text}" if background_image
    background_image.remove
    @doc.xpath('//@data-reactid').remove
  end

  def doc_xml
    @doc.to_xml
  end
end

filename = 'air_canada_center_map.svg'
file = File.read(filename)
process_map = ProcessSvgVenueMap.new(file)
process_map.remove_css
File.write(filename, process_map.doc_xml)

this doesn't work. i was playing around with nokogiri... it just didn't seem to be able to find the elements i was interested in with xpath or any other selectors. WIP.