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KoolGrid can represent hierarchical data structures with spanning cells and grouping rows. <SpanGroupingCollection> must be defined in the Layout to represent hierarchical data structures with spanning cells and grouping rows.

...
<dataProvider>
  <SpanGroupingCollection source="{$gridData}" >
    <grouping>
      <Grouping>
        <SpanGroupingField name="Year" />
        ...
      <Grouping/>
    <grouping/>
...    
  <SpanGroupingCollection/>
</dataProvider>
...

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