document = Nokogiri::XML(File.read(Rails.root.to_s+'/lib/label.xml'))
template = Nokogiri::XSLT(File.open(Rails.root.to_s+'/lib/xsl_which_imports_more_xsl.xsl','rb'))
html_document = template.transform(document)

pdf = WickedPdf.new.pdf_from_string(html_document)

save_path = Rails.root.join('public','filename.pdf')
File.open(save_path, 'wb') do |file|
   file << pdf
end