module Metanorma::Utils

def case_transform_xml(xml, kase) 

def case_transform_xml(xml, kase)
  x = Nokogiri::XML("<root>#{xml}</root>")
  x.traverse do |e|
    e.text? or next
    e.replace(e.text.send(kase))
  end
  x.root.children.to_xml
end