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→Group By
In contrast to the relational GROUP BY statement, the XQuery counterpart
concatenates the values of all non-grouping variables that belong to a specific group.
In the context of our example, all nodes in <code>//people/person</code> that belong to the <code>"preferred"</code> partition are concatenated in <code class="brush:xquery">$ppl</code> after grouping has finished.
You can see this effect by changing the return statement to:
