SOAP 1.2 Attachment Feature

This document defines a SOAP feature that represents an abstract model for SOAP attachments. It provides the basis for the creation of SOAP bindings that transmit such attachments along with a SOAP envelope, and provides for reference of those attachments from the envelope. SOAP attachments are described using the notion of a compound document structure consisting of a primary SOAP message part and zero or more related documents parts known as attachments.