OpenRules may be responsible for business logic representation and execution within ETL frameworks such as Talend. While we do not have a working example of OpenRules and Talend working together, the integration should not be a problems considering that both products are Java-based and open sourced. You may look an integration scheme at http://openrules.com/architecture_soa.htm.
You may integrate OpenRules with Talend as easy as you would do it with any Java program. One of the natural ways is to make an OpenRules-based service to be a subscriber/listener of the Talend-based message queue. If you have any specific requirement and/or have a technical issue, please feel free to contact us directly.