13. A computer-implemented method for matching elements of a schema to entity groups comprised of classes or properties of an ontology, the method comprising: accessing an element of the schema stored in a first storage and an entity group of the ontology stored in a second storage; and matching the element to the entity group in case that the element corresponds to the entity group according to a correspondence test, wherein the element is identifiable with a child node of a parent node of a tree and the entity group comprises a subclass of a class of a further entity group or a property of the class, the further entity group matching to a parent element identifiable with the parent node.
13. A computer-implemented method for matching elements of a schema to entity groups comprised of classes or properties of an ontology, the method comprising: accessing an element of the schema stored in a first storage and an entity group of the ontology stored in a second storage; and matching the element to the entity group in case that the element corresponds to the entity group according to a correspondence test, wherein the element is identifiable with a child node of a parent node of a tree and the entity group comprises a subclass of a class of a further entity group or a property of the class, the further entity group matching to a parent element identifiable with the parent node. 23. The method of claim 13 further repeating matching further elements of the schema to further entity groups of the ontology, wherein the further elements are identifiable with child nodes of a matched parent node of the tree and the further entity groups comprise subclasses of matched class of a matched entity group or properties of the matched class, the matched entity group matching to a matched parent element identifiable with the matched parent node.