[rules-users] Java vs mvel dialects

Hi, I am trying to understand the difference in how drl rules are expressed via the java or mvel dialects. Looking at the drools-examples it is not exactly clear. I was looking at the PetStore.drl which seems to specify the dialects for various rules using both java and mvel. Are there any references to examples which showcase a rule that is expressed both through java and mvel dialects so it is clear what the differences are. The rules in the PetStore.drl which specify java or mvel syntactically seem to look the same. Also, are there any general suggestions as to when a rule author should use the java or the mvel dialect. Thanks. - K