This paper describes SODA a novel ontology alignment method for the OWL-DL format. SODA uses a new approach that consists in computing local and semantic similarities among ontological elements. 1 Presentation of the system SODA [1] (Structural Ontology OWL-DL [2] Alignment), is a new approach that aligns two OWL-DL ontologies using similarity measures [3]. Both OWL-DL ontologies are transformed in two corresponding graphs DL-GRAPH which describe all information in the ontologies. SODA uses the DL-GRAPH to align the two ontologies. It operates into successive steps. The first step, computes local similarity by means of linguistic and structural similarities, whereas the second one computes the semantic similarity. Figure 1 depicts the architecture of SODA system.