Selective pull feature allows you to pull a subset of messages posted on an MPC. The initiating MSH sends a pull signal to the responding MSH along with a pull criteria using requestSM. The responding MSH uses the requestSM parameters to match the messages present in the MPC and sends back the first matching message as a response using requestUM.

Selective pull can be initiated by a business application by providing simple selection item or complex selection item parameters in the wm.ip.estd.as4.msh:sendPull service.

Simple selection, complex selection or both can be used to pull messages from an MPC. Following are the two types of selection:

For information about using selective pull service, see Built-In Services.