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Mastering Structured Data on the Semantic Web: From HTML5 Microdata to Linked Open Data by Leslie F. Sikos Ph.D.

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CHAPTER 7

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Querying

While machine-readable datasets are published primarily for software agents, automatic data extraction is not always an option. Semantic Information Retrieval often involves users searching for the answer to a complex question, based on the formally represented knowledge in a dataset or database. While Structured Query Language (SQL) is used to query relational databases, querying graph databases and flat Resource Description Framework (RDF) files can be done using the SPARQL Protocol and RDF Query Language (SPARQL), the primary query language of RDF, which is much more powerful than SQL. SPARQL is a standardized language capable ...

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