Topic Description
Introduction to: Linked Data In the web today, you can create a link to a webpage that you have no control of. With Linked Data, you can create links to data residing in other databases on the web. Linked Data transcends the physical barriers of machines! How is this done?
Introduction to: RDF RDF is a Graph. RDF stands for Resource Description Framework and it is a flexible schema-less data model. Do not confuse or compare it with XML (more about this later)! It is one of the core technologies of the Semantic Web and the current W3C standard to represent data on the web.
Introduction to: Ontologies Ontologies are used to represent knowledge and reason about data in order to infer new knowledge and check consistency.
Introduction to: RDFa RDFa is another syntax for RDF embedded into HTML.
Introduction to: RDF vs XML The main difference: XML is a syntax while RDF is a data model. RDF has several syntaxes (Turtle, N3, etc) and XML is one of those (known as RDF/XML).
Introduction to: SKOS SKOS, which stands for Simple Knowledge Organization System, is a W3C standard, based on other Semantic Web standards (RDF and OWL), that provides a way to represent controlled vocabularies, taxonomies and thesauri.
Introduction to: SPARQL SPARQL is the standardized query language for RDF, the same way SQL is the standardized query language for relational databases.
SPARQL 101 This is an introductory lesson to the SPARQL query language where we explain the basic SPARQL syntax and start with simple queries.
SPARQL Nuts & Bolts In SPARQL 101, we introduced what SPARQL is, how it relates to other query languages, and went through basic SPARQL syntax.
Introduction to: SPARQL This lesson builds on that foundation, primarily by example. We use many real-world SPARQL queries to illustrate the features of the query language as the quickest way to making you productive.
Introduction to: Open World Assumption vs Closed World Assumption If you are learning about the Semantic Web, one of the things you will hear is that the Semantic Web assumes the Open World. In this post, I will clarify the distinction between the Open World Assumption and the Closed World Assumption.
Introduction to: Triplestores Triplestores are Database Management Systems (DBMS) for data modeled using RDF. Unlike Relational Database Management Systems (RDBMS), which store data in relations (or tables) and are queried using SQL, triplestores store RDF triples and are queried using SPARQL.
Introduction to: OWL Profiles OWL, the Web Ontology Language has been standardized by W3C as a powerful language to represent knowledge (i.e. ontologies) on the Web. OWL 2 defines three new profiles or sub-languages that offer important advantages depending on your application scenario: OWL 2 EL, OWL 2 QL and OWL 2 RL.
Introduction to: Reasoners Reasoning is the task of deriving implicit facts from a set of given explicit facts.
The Business Value of Reasoning with Ontologies ((Co-authored by Héctor Pérez-Urbina)) Reasoning allows for application queries to be relatively simple and easier to understand.