The tutorial first addresses requirements and semantic problems to integrate digital information into large scale, meaningful networks of knowledge that support not only access to source documents but also use and reuse of integrated information. The pros and cons of developing global ontologies are discussed. It is argued that core ontologies of relationships are fundamental to schema integration and play a completely different role to that of specialist terminologies in practical knowledge management. The CIDOC Conceptual Reference Model (CRM) is presented as an example of such a global model. It is a core ontology and new ISO standard (ISO 21127, accepted September 2006), originally designed for the semantic integration of information from museums, libraries, and archives. It is a product of re-engineering the dominant underlying common concepts from representative data structures. It is not prescriptive, but provides a controlled language to describe common highlevel semantics tha...