SAAJ is independent of JAX-WS. JAX-WS uses parts of SAAJ.
SAAJ handles attachments through the older "SOAP with Attachments" (SwA) standard. In JAX-WS attachments are handled through the more recent "SOAP Message Transmission Optimization Mechanism (MTOM)" standard. JAX-WS: Binary Attachments (MTOM) [ December 11, 2008: Message edited by: Peer Reynders ]