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Astract: A crucial prerequisite for the success of Model Driven Engineering (MDE) is the seamless exchange of models between diff erent modeling tools demanding for mappings between tool-specifi c metamodels. Thereby the resolution of heterogeneities between these tool-specifi c metamodels is a ubiquitous problem representing the key challenge. Nevertheless, there is no comprehensive classification of potential heterogeneities available in the domain of MDE. This hinders the specifi cation of a comprehensive benchmark explicating requirements wrt. expressivity of mapping tools, which provide reusable components for resolving these heterogeneities. Therefore, we propose a feature-based classifi cation of heterogeneities, which accordingly adapts and extends existing classifi cations. This feature-based classifi cation builds the basis for a mapping benchmark, thereby providing a comprehensive set of requirements concerning expressivity of dedicated mapping tools. In this paper a rst set of benchmark examples is presented by means of metamodels and conforming models acting as an evaluation suite for mapping tools.

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Keywords: model-driven, model versioning, conflict detection, refactorings
Astract: Within the last years, the popularity and appearance of model-driven software development (MDSD) has increased significantly.
The model-driven paradigm induces a shift from code-centric to model-centric development. Software models are considered as first class entites building the basis for generating an executable software.
Nowadays, MDSD is a widely accepted technology helping software developers to accelerate and simplify their work by raising the abstraction level of the software artefacts they create.
Large-scale software is usually produced by a high number of software developers, who are often working in parallel and spread all over the world. Therefore, the version management of software models is crucial for an effective, collaborative software development. One of the most important components of a versioning system for model artefacts is a precise difference and conflict detection, which is capable of identifying all operations executed by the developers and the eventually resulting conflicts that arise at merging independently changed models.
Without an appropriate difference and conflict detection system, software developers are forced to find occuring problems manually, which is a time consuming process. Especially complex operations, refactorings and language specific conflicts are hard to identify and can lead to serious malfunctions in the produced software if they remain undiscovered.
The main goal of this work is the development and implementation of an intelligent and adaptable conflict detection mechanism for models in the context of versioning. A framework will be presented which is able to precisly calculate the differences and detect conflicts in a generic way. Users may extend this system by providing language specific definitions which will be used to refine the functionality for specific modeling languages. In that way, the quality of the difference and conflict detection can be improved to minimize the need for manual interaction.

Keywords: accessibility, web, software engineering, code generation
Astract: Model engineering is a current trend in software engineering.
Its aim is the automatic generation of executable code from abstract software models. Latest techniques focus mainly on functional aspects of the generated code, e.g. how Java code is generated from UML diagrams.
However, aspects of quality which do not come from the technical requirements are rarely considered. An important aspect of quality represents among other things the accessibility of web pages.
Legislation in Austria requires a barrier free access to official internet appearances for humans with special needs. This should have been implemented until 1st of Jan. 2008. In order to determine the accessibility of web applications so called Web Accessibility Guidelines (WAG) have been developed. For example, there are the WCAG (Web Content Accessibility Guidelines)of the W3C, which already became generally accepted as a de facto web accessibility standard. In order to fulfil the conformity with the legal regulations demanded above, public internet appearances must correspond to the respectively demanded guidelines. In this diploma thesis it is evaluated, in which way modern component frameworks and code generators fulfil the requirements resulting from the given guidelines. Therefore, WAG conform static html pages are used as a starting point. These static pages are developed to dynamic web applications by means of chosen component frameworks and code generators. The result of the generation process of each chosen development technology is finally rendered in form of html pages in the browser. These rendered pages are evaluated by means of WAG evaluation tools (test programs for the WAG conformance) regarding guidelines selected before. The results of this conformance evaluation demonstrate, to which extent the selected Web accessibility guidelines are violated. This evaluation also highlights which of the used development environments are better in terms of WAG conformance.