Linked data 20171106
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Linked Data allows information to be linked across the web using RDF standards and URIs. It utilizes triples consisting of a subject, predicate, and object to uniformly describe relationships between nodes and metadata. There are over 1,000 Linked Open Data sources that can be queried using SPARQL to retrieve and link external information to locally managed data. This enhances search, knowledge retrieval, and allows leveraging of external expertise without needing to develop it in-house. Linked Data is helping to realize Tim Berners-Lee's original vision of the Semantic Web by making more information on the web machine-readable and interconnected.
Linked data 20171106
- 1. Linked Data In Action Using Linked Data to improve your information KM World / Taxonomy Boot Camp 2017 Jim Sweeney, Senior Product Manager Taxonomy and Ontology Solutions
- 2. Linked Data and the Semantic Web • In 1991 Tim Berners-Lee described what he called the World Wide Web, which was meant to, “allow links to be made to any information anywhere.”1 • In the 2010’s we are seeing this concept realized in Linked Data, utilizing RDF standards and other technologies such as SPARQL (Protocol and RDF Query Language) and JSON (JavaScript Object Notation). • With Linked Data protocols, one may send queries across the web to retrieve specific information from any source published in this format. Linking Open Data cloud diagram 2017, by Andrejs Abele, John P. McCrae, Paul Buitelaar, Anja Jentzsch and Richard Cyganiak. http://lod-cloud.net/ 1 https://www.w3.org/People/Berners-Lee/1991/08/art-6484.txt
- 3. A Few Linked Open Data Sources DBPedia (WikiPedia) Getty Arts & Architecture Thesaurus (AAT) GeoData (Locations)
- 4. 1,163 Linked Open Data Sources at Last Count Linking Open Data cloud diagram 2017, by Andrejs Abele, John P. McCrae, Paul Buitelaar, Anja Jentzsch and Richard Cyganiak. http://lod-cloud.net/
- 5. Linked Open Data Accessibility • There must be resolvable http:// (or https://) URIs. • They must resolve, with or without content negotiation, to RDF data in one of the popular RDF formats (RDFa, RDF/XML, Turtle, N-Triples). • The dataset must contain at least 1000 triples. • The dataset must be connected via RDF links to a dataset that is already in the diagram. This means, either your dataset must use URIs from the other dataset, or vice versa. We arbitrarily require at least 50 links. • Access of the entire dataset must be possible via RDF crawling, via an RDF dump, or via a SPARQL endpoint.
- 6. RDF and Triples • RDF or Resource Description Framework provides standards that we use to uniformly describe the relationships between nodes, as well as describe other attributes that we want to assign to our data as metadata. • The standard establishes a subject-predicate- object unit called a triple. • One such RDF standard, FOAF (Friend of a Friend), is a collection of relationships and attributes describing people, their relationships to one another, and their activities. • In this example, we see “Alice” is identified as a member of a family, organizations, based near a location, and with a descriptive home page.
- 7. What Linked Data Allows • The structure of Linked Data allows us to link to external sources to append to and enhance the information that we are storing and managing locally. • By selecting Sources and the Properties of those Sources we can pick and choose which elements are relevant to our own data and link to them.
- 8. Joining Linked Data to Your Information • One is able to perform a search of the specified Source, which returns the previously selected Properties. • A Relationship is chosen and those Properties that you wish to link to your internally managed listings and they will now appear as a Linked Data attribute for use with external applications.
- 9. The Benefits of Linked Data Usage • Leverage the work of external experts rather than hiring for in-house development. • Take advantage of a much deeper set of knowledge than you would normally have access to. • Access multiple sources and, therefore, multiple points of view for a broader scope of context. • Use Linked Data to publish your own information and make it available via the WWW. • Enhance Search and Knowledge Retrieval…
- 10. Generic search suggests results by querying Linked Data sources such as DBPedia. Relevant results returned via taxonomy term “roll-up” to related and broader terminology. Associated articles and other information may also be produced.
- 11. The Age of Linked Data • Linked Data begins to usher in a new age of the World Wide Web. (Web 3.0 / the Semantic Web) • It provides a new world of resources for the Knowledge Worker • The hope is that someday more information than not will be publicly available via Linked Data for access by any user of the web. The Semantic Web is not a separate Web but an extension of the current one, in which information is given well-defined meaning, better enabling computers and people to work in cooperation. -Tim Berners-Lee https://www.brainyquote.com/authors/tim_bernerslee
- 12. Jim Sweeney Sr. Prod. Mgr., Taxonomy and Ontology Solutions jim.sweeney@synaptica.com www.synaptica.com