[GeoNetwork-users] Is it possible to search by group or category using CSW?

Good Morning,

I need to to search for metadata records by group and/or category and I would prefer to search in GeoNetwork using the CSW Interface. Is this possible or do I have to use the GeoNetwork search Service to do this? If it is possible, how do I do it? I am using GeoNetwork 2.6.3.

Best Regards,
Mirko bothe