Open semantic linked data
0 likes697 views
The document provides an introduction to open, linked, and semantic data, emphasizing the goal of connecting and exploring data to uncover hidden patterns and opportunities. It discusses the importance of open data, its quality, and how it can influence policy and service delivery, along with the role of RDF and ontologies in modeling knowledge. The text also highlights the limitations of the original web and the necessity for linked data to enhance information exchange.
![URI
Uniform Resource Identifiers
a compact sequence of characters to identify an
abstract or physical resource
scheme:[//authority]path[?query][#fragment]
e.g. http://www.regione.sardegna.it/uri](https://image.slidesharecdn.com/formez-opensemanticlinkeddata-120524102312-phpapp02/85/Open-semantic-linked-data-19-320.jpg)
Open semantic linked data
- 1. OPEN, LINKED, SEMANTIC DATA AN INTRODUCTION Dr. Ronald Ashri - Istos srl http://www.istos.it
- 2. @ronald_istos Web App Development Travel / Semantic Web www.istos.it Technical Director www.bluespark.com
- 3. THE GOAL
- 4. connect and explore data to discover hidden patterns and create new information new information enables us to formulate better solutions and identify new oportunities
- 9. OPEN DATA Data that is freely available for everyone to access use and republish
- 10. OPEN PUBLIC DATA Objective, factual, non-personal data on which public services run and are assesed, and on which policy decisions are based, or which is collected or generated in the course of public service delivery (data.gov.uk)
- 11. GOVERMENT AS A PLATFORM Allow citizens to analyze and use data in many different ways Influence policy based on facts
- 12. DATA QUALITY ★ Available on the web (whatever format), but with an open licence ★ ★ Available as machine-readable structured data (e.g. excel instead of image scan of a table) ★ ★ ★ as (2) plus non-proprietary format (e.g. CSV instead of excel) ★ ★ ★ ★ All the above plus, Use open standards from W3C (RDF and SPARQL) to identify things, so that people can point at your stuff ★ ★ ★ ★ ★ All the above, plus: Link your data to other people’s data to provide context
- 13. THE SEMANTIC WAY Build Models Exchange Information Visualize - Analyze Derive new fact (calculate with knowledge)
- 14. THE PROCESS Build an ontology or vocabulary State facts about domain Correlate facts - reduce ambiguity Reason about ontologies and facts
- 15. ontology is a description of knowledge about a domain of interest ὸντος = that is how it is
- 16. arbor porhyriana Substance immaterial material Body Spirit animate inanimate Living Mineral sensitive insensitive Animal Plant rational irrational Human Beast 234AD, Tyre (Lebanon)
- 17. knowledge on the web is modeled using RDF, RDFs and/or the Web Ontology Language - OWL
- 18. RDF Resource Description Framework directed labelled graph capitalOf Cagliari Sardegna subject predicate object
- 19. URI Uniform Resource Identifiers a compact sequence of characters to identify an abstract or physical resource scheme:[//authority]path[?query][#fragment] e.g. http://www.regione.sardegna.it/uri
- 20. RDF + URI http://example.org/capitalOf Cagliari Sardegna http://www.comune.cagliari.it/uri http://www.regione.sardegna.it/uri
- 21. RDF + URI eg:livesIn Ronald Sicily http://www.istos.it/ronald#me http://dbpedia/resource/Sicily eg:worksFor Ronald Istos http://www.istos.it/ronald#me http://www.istos.it/uri foaf:based_near Istos Ispica http://www.istos.it/uri http://dbpedia/resource/Ispica
- 22. RDF SCHEMA RDF is a general way to describe structured information RDF Schema extends RDF to express general information about a data set Resources, Classes, Literals, Datatypes, Properties range, domain, subClassOf, subPropertyOf
- 23. RDFS SERIALIZATIONS N3, N-Triples, Turtle Human readable, limited software support RDF XML takes advantage of tools to parse XML RDFa - enables RDF to be embedded in HTML
- 25. WWW 0.1 the original web was thought of with ontological information at its heart http://www.w3.org/History/1989/proposal.html
- 27. THE SEMANTIC WEB
- 28. the semantic web provided tools but not enough method - the linked data effort tries to rectify this
- 29. EXCHANGE MORE INFORMATION THE LINKED DATA EFFORT
- 30. 1. Use URIs as names for things 2. Use HTTP URIs so that people can look things up 3. Provide useful info using standards (Sparql) 4. Include links to other URIs
- 31. SPARQL Protocol and RDF Query Language Graph pattern matching Uses RDF triples but they may be variables The reply is the RDF graph equivalent to the subgraph described
- 32. PREFIX foaf: <http://xmlns.com/foaf/0.1/> SELECT ?name ?email WHERE { ?person a foaf:Person. ?person foaf:name ?name. ?person foaf:mbox ?email. } endpoint: world-wide web names and e-mails of every person in the world!
- 35. DRUPAL 7 FOR SEMANTIC ANNOTATION Annotation happens in the background User does not need to be aware of complexities
- 36. LOOKING AHEAD Technology and tools are getting there Data needs to remain open Spread the word - Annotate!