title:          This week's order lines
    object_type:    order_line
    query:
                    ... query params that return a list of Object IDs ...
    row_vars:
        order:      $order_line.order                   # Stores $order 
        product:    $order_line.product                 # and $product in the %vars hash
    columns:
        -
            title:  Order
            value:  $order.id                           # $order->id
        -
            title:  Order date
            value:  $order.create_date.yMonthd($lang)   # $order->create_date->yMonthd($lang)
        -
            title:  Order total
            value:  $order.total | currency             # currency ($order->total)
            format:
                    align:  right
        -
            title:  Invoice no
            value:  $order.invoice_id || 'Not invoiced' 
        -
            title:  Pickup address
            value:  $order_line.pickup_id 
                        ? $order_line.pickup_id | lookup ('pickup',$lang,$order_line.pickup_id)
                        : $order_line.pickup_text