Semantic Web explained in 247 seconds!

Semantic Web A “web of data” not pages. Facts are expressed as RDF triples (subject–predicate–object) with global URIs, so machines can link, combine, and reason across sources. Queried with SPARQL. RDFS (RDF Schema) https://www.w3.org/TR/rdf-schema/ The basics of a schema for RDF graphs: define classes (e.g. Person), properties (e.g. birthPlace), and simple relationships like rdfs:subClassOf, rdfs:domain, rdfs:range. Enables light inference (e.g. if Student ⊆ Person, every student is a person). OWL (Web Ontology Language) https://www.w3.org/OWL/ Adds rich logic on top of RDFS. You can state class equivalence, disjointness, restrictions (some/all values from, cardinalities), and let a reasoner infer new facts or detect inconsistencies (e.g. “Nothing can be both Cat and Dog”). Use OWL when you need precise meaning and automated reasoning. SKOS (Simple Knowledge Organization System) https://www.w3.org/2004/02/skos/ For concept schemes (thesauri, taxonomies, tag sets). Models concepts with preferred/alternate/multilingual labels and relationships like broader, narrower, related. Great for aligning synonyms (e.g. car, auto, vehicle) and managing vocabularies used in tagging and search. SHACL (Shapes Constraint Language) https://www.w3.org/TR/shacl/ For data validation. Defines “shapes” that data must satisfy (required properties, datatypes, cardinalities, patterns, closed sets). Think quality control: keep bad triples out, confirm good triples are present (e.g., every Toy must have a name string; birthdate must be a date, etc.). How they fit together: - RDFS/OWL: define meaning & logic (the model). - SKOS: control the words we use (labels & vocabularies). - SHACL: enforce data quality (constraints). - SPARQL: query the graph. 🔗 Stay connected for more content Follow us on LinkedIn: https://www.linkedin.com/company/the-semantic-owl 👍 Don’t forget to Like this video if you find it useful Subscribe to the channel for regular updates Click the bell icon 🔔 to get notified when we post Drop a comment below with your questions or topics you’d like us to cover Thanks for watching and joining us on this semantic journey! #TimBernersLee #ontology #RDF #SemanticWeb #KnowledgeGraph #SemanticTechnologies #W3CStandards #LinkedData #DataScience #ArtificialIntelligence #KnowledgeGraphs #LearnRDF