Routing Rules in a Mediator component carry several attributes that govern the routing rule run time behavior. These include: XSLT or XQuery used for transformation, the filter expression, target operation, the parallel or sequential indicator, the Schematron document used for validation, the native validation and the value assignment (for example for header properties).
In SOA Suite 12c, we can conditionally set overriding values for each of these attributes. That means that at run time, based on the evaluation of some expression against the contents of the request message (or the time of the day, day of the week,…) , we can use a different transformation stylesheet or assign a different header value. This dynamic override of the static rule definition is configured using the Override Using option – shown last in the figure overhead.