M2M Ontology Processor is in charge of processing, storing, or providing discovery function to ontologies published from outside or inside of the M2M domain. M2M Ontology Processor may functionally consist of an ontology processing component, an ontology classifying component, an ontology discovery component, and ontology repository. The ontology processing component may process published ontologies external and internal of M2M namespace, which may be used to provide semantics information to objects/entities. The ontology classifying component may classify ontologies and store them in the right hierarchy/location in Ontology Repository for discovery and usage. Ontology discovery component may provide ontology discovery and determine the matching one(s) for a requester to use. Ontology repository may store any ontology models that are published or generated external and internal to M2M domain. Those ontologies may be used for resources to enable semantics. Thus, ontology repository may interact with ontology classifying component and ontology discovery component.