[rules-users] combining fact model and processes

Hello, we are starting a project using Drools and we are interested in the conbination of fact models defined in drl files and processes. We have been looking for documentation regarding this issue, but we have seen only examples of combining drl-defined types from within rules. We are interested in using types defined in drl files (as explained in section 4.7.2 of the drools engine reference) inside process constraints. Is this possible? many thanks in advance, Jordi