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Workflow Manual / Version 2301

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4.1.7.3 Guards

Guards are Boolean expressions that must evaluate to "true" before the task is activated. The expression may be based on the current values of workflow variables, on resources in the Content Management Server or on external resources. A possible use of guards is to determine the resources that are required for the task. The task then is deactivated until all resources are freely available. Thus, the workflow suspends execution until the guard is fulfilled.

In Example 4.7, “Example of a Guard” you see a guard that checks whether the property isCheckedOut_ of the resource contained in the variable "document" (variable="document") is set to false (the stored value is negated by Not). That is, the task continues when the content item is checked in.

<Guard>
  <Not><Read variable="document" property="isCheckedOut_"/></Not>
</Guard>

Example 4.7. Example of a Guard


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