A data processing system (20) including a unit (29) producing data elements; data processing members (21) for processing the data elements; and a first data-base (22). A user is provided with at least a part of the content of the data element and the option of selecting the name information of at least one subscriber. The system fetches the address of the subscriber in the telecommunications system; generates metadata based on the address information; and attaches it to the data element. The attachment of person-based metadata to data elements becomes easier, and the processing of metadata during storage is improved.