Hi Vlad, On 3/7/07, Olenin, Vladimir (MOH) <Vladimir.Olenin(a)moh.gov.on.ca&gt; wrote: If you're only comparing strings, you can write Record( field == "xxx" ) without any separate binding. I'm not sure about custom implementations of Object::equals though. Maybe those have to be called explicitly. That's an interesting question however. I'd be great if someone could elaborate on that. Additionally, using eval just executes the Java code in the expression and hinders the engine to make a lot of optimizations. I'd imagine that the difference in speed is not really measurable. The only difference is one level less of indirection in the Java code in the first approach. Not that much, really. If you're really in need of that much optimization, you better try to eliminate the eval first and then maybe take a look at other components of your application. Greetings Marcus