Abstract: An automated method for semantically representing a system of uses an ontology design pattern that allows model transformation from a tag representation to an ontological structure and back. Thereby, a tagging-based data model, e.g., according to Haystack Project, is provided for representing at least one of said devices by an entity, wherein each entity is associated by at least one tag. The method includes generating a semantic web representation and integrating the semantic web representation into an ontological model. This integration allows for an easy model instantiation corresponding to annotation with tags from a pre-defined vocabulary which has the advantage of modeling entities with low computational power and, in parallel, maintaining a representation by an ontological graph knowledge on the other hand. The ontological graph knowledge may grant reasoning and search mechanisms by standard interfaces using query languages.