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68 N. Russell and A. ter Hofstede

Fig. 2.30 Data passing to/from a multiple instance task in YAWL

Similarly for data output from a multiple instance task, there are also two queries:
The instance query gathers the instances of the task variables from each task
instance at their completion.
The aggregate query coalesces the resultant data elements into a single record-
based net variable.

Figure 2.30 illustrates how individual instances of the iTestResult variable are popu-
lated in the Evaluate Results multiple instance task from the TestResults net variable
and also how the results are coalesced at the conclusion of the task. The XQuery
expression required for each of the queries is also shown.