The MTOM spec has been made official with the W3C by moving to REC status. This is good news for WSE 3.0 as it ensures that a finalized standard can now be implemented and used to develop interoperable solutions to transmit binary data as part of a SOAP message. The benefit of MTOM is that it uses an XInclude-like approach with a element in the message body to represent data in the MIME attachment. It is just like an inclusion mechanism. MTOM is sometimes referred to as being XML Infoset friendly, which simply means that as a result of having this element to represent a part from the attachment other WS-* specs can be easily composed with it, typically encryption and signing. DIME for attachments is now going to start disappear as a result of this spec approval.