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KoolGrid can represent hierarchical data structures with grouping rows. <GroupingCollection> must be defined in the Layout to represent hierarchical data structures with grouping rows. This example demonstrates how to display the JSON data as a hierarchical representation with grouping rows by From column.

...
<dataProvider>
  <GroupingCollection source="{$gridData}" >
    <Grouping>
      <GroupingField name="From" >
    <Grouping/>
  <GroupingCollection/>
</dataProvider>
...

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