What are semantic technologies, how do they work, and why do they matter for enterprise architecture and information management?
The World Wide Web was built to share documents between humans — but semantic technologies, as Tim Berners-Lee foresaw from the outset, make it possible to share and query meaning between machines at web scale. This 2011 lecture by Graham McLeod, delivered at the University of Cape Town, provides a thorough and accessible introduction to the semantic web stack for enterprise practitioners.
Starting from first principles — what semantics means, and why the distinction between syntax and meaning matters — the lecture works through the core W3C standards: RDF as a graph-based data model where every fact is uniquely addressable via a URI, SPARQL as the query language that can span multiple distributed datasets as a single conceptual database, OWL as the web ontology language that enables classification, inferencing, and richer knowledge organisation, and linked open data as the practical realisation of these ideas at internet scale.
A particularly illuminating section demonstrates how two independently published datasets about the same book — one in English, one in French — can be automatically merged and queried together simply by sharing a common URI and a few bridging statements, illustrating the power of the approach for enterprise data integration. Real-world applications covered include Siri, DBPedia, semantic video indexing, and geo-spatial data integration.
For enterprise architects and information architects grappling with data integration, knowledge management, or the foundations of AI-driven systems, this lecture provides both the conceptual grounding and the practical vocabulary needed to engage seriously with semantic technologies.
Originally presented by Graham McLeod as a guest lecture at the University of Cape Town, June 2011.