#144 - define bindings for attachment mechanisms
•We need bindings defined for these in our WSDL.
–Attachments allow portions of what is transferred to use a different encoding.
•Resolved: Once WSDL subgroup finishes base definitions … in v1
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–Correlated: #148 - Can data in attachments have a different encoding  then message body?
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–Should the type of the markup field be base64Binary? (no)