With the evolution of the Web evolving towards the Semantic Web, where the information should be presented in a meaningful way for both humans and machines, arises the need for semantic interoperability. By interoperability we understand the use of meaningful representation mechanisms that allow for information exchange among agents. There is a consensus that ontologies will be this representation model. The information exchange process depends on our ability to engage two or more ontologies in conversation. In this paper the focus is on the compatibility of different ontologies. We propose a strategy for automatic alignment of ontologies, implemented by an ontology taxonomic alignment component - the CATO component.