THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
MTOM is a standard which allows your services to transfer binary data efficiently and conveniently. Many frameworks have support for MTOM - Axis2, JAX-WS RI, JBoss WS, XFire, Microsoft's WCF, and more.
If the binary is part of the XML document, it needs to be base64 encoded - taking CPU time and increasing the payload size. When MTOM is enabled on a service, it takes binary data which might normally be part of the XML document, and creates an attachment for it.
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