Abstract: In an approach, a processor identifies subgraphs of predefined patterns in a first graph, the first graph: (i) representing a specific ontology and (ii) comprising nodes representing first entities and first edges representing relationships between the first entities. A processor represents the identified subgraphs by respective second graphs, thereby forming multi-relational graphs, each second graph comprising nodes representing second entities and second edges representing relationships between the second entities, where: the second entities are the respective nodes of the first graph; and each second edge indicates that the two second entities linked by the second edge are part of a pattern of the predefined patterns. A processor inputs the multi-relational graphs to a multi-relational graph neural network for generating output in accordance with the specific ontology. A processor provides the output.