gistfile1.txt

<mql>
  <domain_type>olap</domain_type>
  <domain_id>SteelWheels</domain_id>
  <model_id>SteelWheelsSales</model_id>
  <selections>
    <selection>
      <!-- mql view = olap hierarchy -->
      <view>product</view>
      <!-- mql column = olap level -->
      <column>product</column>
    </selection>
    <selection>
      <view>measures</view>
      <column>Quantity</column>
      <!-- mql aggregation = implicit for measure member -->
      <aggregation>SUM</aggregation>
    </selection>
  </selections>
</mql>

Equivalent MDX:

SELECT {[Measures].[Quantity]} ON Axis(0)
, [Product].[Product].Members ON Axis(1)
FROM [SteelWheelsSales]