Description of problem: As we introduced canned dynaGroup expressions, be it part of plugin, we need to extend plugin validator, to make sure plugin developer created "correct" expressions. Version-Release number of selected component (if applicable): RHQ 4.10.0 Additional info: This may be very hard task do do proper validation. Validating dynaGroup expression without running server is not possible, but we may still do simple validation - can we successfuly parse canned dynagroup descriptor? - are the definitions correct? (data types, missing properties) - hopefully we can at least validate syntax of dyna-group expression