EAI Siebel Adapter Attachment output - how to access document

I'm running the EAI Siebel Adapter with an Attachment Integration object and I get the output below. However, I have not been able to figure out how to access the base64 encoded document. I would like to access that element and pass it back in a property set to an internal application that is being created in Open UI, but does not incorporate applets for the UI.

I have tried Get Child child(0) and that gives me the whole Siebel message. I have tried child(0).child(0) and that only gives me the List of Attachments piece. if I try child(0).child(1) it says there is only 1 child. I have tried to use the XML Hierary Converter to a property set and it only converts the list of attachments piece and not the document piece.