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. 21. The method of claim 13 wherein the correspondence test comprises: testing if one or more elements identifiable with child nodes of the child node match to one or more entity groups that comprise subclasses of a class of the entity group, properties of the class, or properties of the subclasses; and evaluating matches of the one or more elements to the one or more entity groups according to an evaluation function.