[rules-users] Function call in LHS

Hello, I am new to Drools. I have downloaded and installed Drools 4.0.7. After having read the documentation, I saw that it is possible to create function in the .drl file. I succeed in creating a function, calling it in the LHS with eval() instruction or in the RHS. But, is it possible to call a function in the LHS out of an eval() ? For example, I would like to use a pattern such as : $tmp : MyClass( name == MyFunction() ) Thanks in advance. Regards. JB