Create XML from Hash recursively using Nokogiri

hash_to_xml_example.rb

hash_tree = {} # hash where all the members are also hashes, even the "leaf nodes"
def xml_node(node, children, xml)
  xml.send(node){
    children.each do | n, c |
      xml_node(n, c, xml)
    end
  }
end

builder = Nokogiri::XML::Builder.new do | xml |
  xml.root {
    hash_tree.each do | k, v |
      xml_node(k, v, xml)  
    end
  }
end