This scenario is under delevopment, and it is necessary to undersand could this be performed using biztalk soap adater only. Web services will be oriented to biztalk compatibility, so the way they receive data is not important. At the moment it is necessary to understand what cases soap adapter supports. In future integration will be expanded, so it is necessary that all actions are performed with biztalk built-in tools. Base64 encoding could fit only if BizTalk can decode the document without any programming or external additions.
