The document discusses the expressive power of UML for web engineering (UWE). [1] UWE uses UML for requirements analysis, conceptual modeling, navigation design, presentation design, web scenarios, task modeling, and deployment design. [2] UWE defines a UML profile for navigation and presentation design with stereotypes. [3] The authors aim to improve UWE through better tool support in ArgoUWE and semi-automatic code generation with UWEXML based on UML design models.