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Over the last few years, there has been considerable research in the area of Software Architecture. However, relatively little attention has been paid to the specification of real-time properties of such architectures. This paper presents the Xelha architectural description language which is intended to overcome this deficiency. The language offers both a task model and a resource model. The former models component interactions as tasks with associated pools of resources. The latter provides hierarchies of abstract resources. In addition, the use of object-oriented typing allow us to introduce some dynamism to architecture specifications. Finally, Xelha provides support for the specification of both static QoS management (ie desired level of QoS) and dynamic QoS mangement (ie mechanisms to attain the contracted level of QoS).