Hi, We are planning to use DSL/DSRL approach with generic DSL template like say [condition][]The {object} has valid {field}={object}({field} != null ) [condition][]there is object {obj} that = {obj}() [condition][]- has {attr} equal {val} = {attr} == {val} [condition][]- has valid {attr} = {attr} != null [condition][]- and has {attr} equal {value}= && {attr} == {value} But there are quite few of requirements like to have DSL rules that can generate expression as follows: exists Employee( attribute name not equals "xxx" && the attribute subOrdinate is not null && eval( the attribute $dept.getId() is not null && attribute $dept.getId() follows pattern "I" && ( ! (the attribute $dept.getHeadOfDpt() equals name) ) ) I am not sure if this is possible with DSL. Using '-' operator we cannot really add '&&', '||' conditions it by-default expands to ',' separated and conditions. And wirtting generic rules with and/or is not really dynamic to allow any number of expressions in evaluation. i am struggling to get this run since long time so any help/thoughts on this would be highly appriciable !!! Thanks & Regards, -Maverik -- View this message in context: http://drools-java-rules-engine.46999.n3.nabble.com/Writting-generic-DSL-... Sent from the Drools - User mailing list archive at Nabble.com.