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A set of key/value pairs which specifies the field-dimension mapping that is available for processing dimensions. The key specifies the name of the field to which the dimension will be mapped.

The key has to match the column name that is used in the columns definition.

<script>
  var dataSource = new kendo.data.PivotDataSourceV2({
    columns: ["ProductName" ],
    rows: ["Category"],
    data: [{ ProductName: "Chai", UnitPrice: 42, Cateogry: "Beverages" } ],
    schema: {
      cube: {
        dimensions: {
          ProductName: { caption: "All Products" },
          Category: { caption: "All Cateogries" }
        }
      }
    }
  });

  dataSource.fetch(function() {
/* The result can be observed in the DevTools(F12) console of the browser. */
    console.log(dataSource.data(), dataSource.axes());
  });
</script>

The name of the field which maps to the dimension.