Similar to URLs identifying and locating Web pages, URIs allow to identify and access data, metadata and schema elements in a globally unique way.
The Linked Data principles were coined by Tim Berners-Lee more than a decade ago. Meanwhile they are pretty widely applied on the Web. More than 100 Billions RDF Statements are meanwhile available as Linked Data and more than 20% of the Web pages are annotated with structured data according to the schema.org vocabulary backed by the large search engines Google, Bing and Yandex. Meanwhile also applying the Linked Data principles in enterprise settings is gaining traction:
The W3C Resource Description Framework (RDF) is based on expressing data, information and knowledge in simple statements (also called facts, triples) consisting of a subject, predicate and object (similar as sentences in English).
Using URIs, we can interlink previously disconnected data silos in a flexible and fine-grained way thus seamlessly connecting enterprise information systems and data sources along value chains.
Meanwhile a variety of mapping standards is available from W3C and implemented by vendors to map and represent original data models to RDF, including RDF/XML for XML, R2RML for relational data, JSON-LD for JSON, or RDFa for HTML.
The Semantic Web Layer Cake today
“A Little Semantics Goes a Long Way”
RDF is the Lingua Franca of Data integration and it has many technology interfaces:
- XML with RDF/XML
- JSON with JSON-LD
- Relational Data with R2RML
- HTML with RDFa
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