"Modeling hetero-Homogeneous Hierarchies and Mapping to OWL"
, in Betreuung: o. Univ.-Prof. Dr. Michael Schrefl, unter Anleitung von Mag. Bernd Neumayr, 6-2010
Modeling hetero-Homogeneous Hierarchies and Mapping to OWL
Sprache des Titels:
The diploma thesis is devoted to a conceptual modeling approach for hetero-homogeneous hierarchies with multiple levels of abstraction. These hierarchies are homogeneous with respect to a common schema, defined by a single root node and prescribed for all sub-hierarchies, and are heterogeneous with respect to refined schemata for sub-hierarchies. In particular, the approach relies on so-called Generalized Multi-Level Objects and Generalized Multi-Level Relationships, which permit to represent objects and relationships among these objects at different levels. Both constructs can be arranged in concretization hierarchies, which compromise different aspects of abstraction hierarchies like e.g. aggregation, classification and generalization.
In addition, a semantic-preserving mapping of such hierarchies to the decidable fragment of OWL (Web Ontology Language) is presented to render the approach from conceptual modeling to the semantic web and ontological engineering. By suitably combining closed world assumption and open world assumption, a meta-modeling facility in OWL is obtained, where OWL semantic reasoners allow e.g. consistency checks and respective query executions. Finally, data can be accessed in the semantic web at different abstraction levels of hetero-homogeneous hierarchies, while its quality is improved.
In the diploma thesis we mainly continue the ideas of Neumayr et al. [2009a,b, 2010], which are partially revised, compared to and complemented with own ideas and results.