How can I get a Drools ruleflow to wait for input?

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Issue

In a drools flow, I want the flow to be processed in order, but some facts are inserted from outside (such as through web services invocations).
How can I get the drools ruleflow to wait for input before continuing?

Environment

JBoss Business Rules Management System (BRMS)
- 5.x
JBoss Developer Studio (JBDS)
- 3.0.1.GA and beyond

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