Current Web generation techniques are mainly hard-coded for predefined architectures of Web applications. Consequently, there is a gap between Web design models and the final implementation. We solve this problem, following with our approach the Model-Driven Architecture (MDA) principles of automatic generation of software systems based on model transformations. In this context, we present a transformation process and propose a visual and textual specification for the transformations using the forthcoming OMG standard Query /Views/ Transformations (QVT). Our proposal is illustrated by transformations involving elements of the UML-based Web Engineering (UWE) metamodel and the WebSA metamodel, showing this way how both approaches are integrated.