class Metanorma::Generic::Converter

def metadata_ext(node, ext)
  super
  if configuration.metadata_extensions.is_a? Hash
    metadata_ext_hash(node, ext, configuration.metadata_extensions)
  else
    Array(configuration.metadata_extensions).each do |e|
      a = node.attr(e) and ext.send e, a
    end
  end
  empty_metadata_cleanup(ext.parent)
end