1xml.instruct!
 2xml.Item ID: id, xmlns: 'https://www.example.org/item#' do
 3  signature_for reference_id: id, xml: xml
 4  xml.Encrypted xmlns: 'https://www.example.org/item#' do
 5    key_info = ::Xml::Kit::KeyInfo.new
 6    key_info.retrieval_method.uri = "#EK"
 7    encrypt_data_for(xml: xml, key_info: key_info) do |xml|
 8      xml.EncryptMe do
 9        xml.Secret "secret"
10      end
11    end
12  end
13end