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6.3.2. Advisory Ordering

On the other-hand, when score="0" is specified for a constraint, the constraint is considered optional and only has an effect when both resources are stopping and or starting. Any change in state by the first resource will have no effect on the then resource.
Example 6.4. Example of an optional and mandatory ordering constraint

    <rsc_order id="order-1" first="Database" then="Webserver" />
    <rsc_order id="order-2" first="IP" then="Webserver" score="0"/>

Some additional information on ordering constraints can be found in the document Ordering Explained