class Sanitize

def clean_node!(node)
  raise ArgumentError unless node.is_a?(Nokogiri::XML::Node)
  node_whitelist = Set.new
  unless @transformers[:breadth].empty?
    traverse_breadth(node) {|n| transform_node!(n, node_whitelist, :breadth) }
  end
  traverse_depth(node) {|n| transform_node!(n, node_whitelist, :depth) }
  node
end