class Xcodeproj::Workspace

def to_s
  contents = ''
  stack = []
  @document.root.each_recursive do |elem|
    until stack.empty?
      last = stack.last
      break if last == elem.parent
      contents += xcworkspace_element_end_xml(stack.length, last)
      stack.pop
    end
    stack << elem
    contents += xcworkspace_element_start_xml(stack.length, elem)
  end
  until stack.empty?
    contents += xcworkspace_element_end_xml(stack.length, stack.last)
    stack.pop
  end
  root_xml(contents)
end