26. The method according to claim 24 , wherein the Adaptation Module provides the choose element with an empty attribute which supports a functionality that a set of media appropriate for the current QoS can be empty.
26. The method according to claim 24 , wherein the Adaptation Module provides the choose element with an empty attribute which supports a functionality that a set of media appropriate for the current QoS can be empty. 27. The method according to claim 26 , further comprising evaluating an associated priority of an adaptation possibility by sorting all children of a par element according to their priority, merging configurations of a first two child elements by an AND operator in such a way that priority of resulting configurations includes a priority of a higher prioritized child appended with a priority of a lower-prioritized child, and repeatedly merging a result with all other children of the par element.