A roof system for a motor vehicle with a roof opening and a movable roof part for opening up and closing the roof opening, the roof part being assigned a web guide on opposite sides, the web guide permitting a longitudinal displacement and a vertical shifting of the roof part. The data processing apparatus includes a plurality of ports, a memory, a determining unit, and a processing unit. Furthermore, such an example method may include estimating an interference target value for the one or more UEs in communication with the base station based at least on the measurements received from the one or more UEs and the load indicator values received from the one or more neighboring base stations. At least one query associated with a query language that supports a hierarchical data structure is obtained. Thus, features of the PBX network are available to the remote wireless device even though it is not physically connected to the PBX.