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Flexible Decision Automation for Your zEnterprise with Business Rules and Events by Tim Wuthenow, Mike Johnson, Guy Hindle, Andy Flatt, Fiona Crowther

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Calling out from a ruleset to a VSAM file to augment data
Occasionally, you are required to call out from a ruleset to augment the data that is required to make a decision. Only call out from a ruleset to augment data in the following circumstances:
The data is not easily accessible to the application program.
The decision cannot be made without the data.
The data is required only in exceptional circumstances by the decision.
The JzOS ...

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