The question doesn't make sense. The data in the DOM is in an internal form, where the concept of "escaping" doesn't apply. When you convert that internal form to an XML document (e.g. a text file), then you might want to not escape certain data. That conversion is called "serializing". So you are asking a question about the serializer that you will choose to use, whatever it is.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com