The underlying idea of adopting existing vocabularies is to enable an optimal reuse of the work that has already been done and acknowledged on linked data. In this way, it is not only possible to create datasets based on proved solutions easier and faster than starting from scratch, but also contribute to a proper expansion of the Web of data, by clearly linking new datasets to existing and commonly adopted resources.
When reusing existing vocabularies, it is important to first take the time to look for what is currently available. For example, there are several vocabularies for linked data suggested by the W3C. An overview of vocabularies is provided in the following table.
In addition, it is possible to find existing vocabularies using dedicated search engines for the Semantic Web (e.g., Watson, Sindice, Semantic Web Search Engine, Swoogle, and Schemapedia), and other platforms, such as the LOV directory, Prefix.cc, Bioportal for the biological domain, and the European Commission's Joinup platform. Once a potential vocabulary has been identified, one should critically review this vocabulary according to the following criteria in order to decide whether to adopt it or not:
Another good source before starting with defining new vocabularies is the http://sameas.org website, which contains a collection of triples that contain the “owl:sameas” construct. The “owl:sameas” construct is also useful when you find out that a term in someone else’s vocabulary means the same thing in your own vocabulary. In that situation it is not necessary to change your vocabulary but to only publish a triple with owl:sameas. Note: owl:sameas should only be used for relating two pure synonyms, i.e., two terms that refer to exactly the same concept. If the relationship is less precise, owl:subClassOf may be used to relate one concept to a slightly more general concept.
Een Uniform Resource Locator (afgekort URL) is een gestructureerde naam die verwijst naar een stuk data. Voorbeelden zijn het unieke adres waarmee de locatie van een webpagina op internet wordt aangegeven of een e-mailadres. In de naam is alle informatie opgenomen over de benodigde techniek om de betreffende gegevens te bereiken. De URL is een bijzondere vorm van de URI.
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