Introduction to Semantic Web for GIS Practitioners
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Introduction to Semantic Web for GIS Practitioners
- 4. Introduction The Web Today Large number of integrations - ad hoc - pair-wise Too much information to browse, need for searching and mashing up automatically Each site is “understandable” for us Computers don’t “understand” much ? Millions of Applications Search & Mash-up Engine 010 0 1 1 0 0 1101 10100 10 0010 01 101 101 01 110 1 10 1 10 0 1 1 0 1 0 1 0 0 1 1 0 1 1 1 10 0 1 101 0 1
- 5. Introduction The Problem: “Semantic Gap” Sensor Data Semantic Gap Symbolic Description
- 6. Introduction “Understanding” Means Bridging the Gap understanding Sensor Data Symbolic Description
- 7. Introduction Do We Really Know What “Understanding” means? [ source http://www.thefarside.com/ ]
- 17. Introduction The Semantic Web 4/4 Semantic Web Fewer Integration - standard - multi-lateral […] better enabling computers and people to work in cooperation. Even More Applications Easier to understand for people More “understandable” for computers Semantic Mash-ups & Search
- 18. Introduction Linked Data Standards WebMGS 2010, 27.8.2010 View the full talk at http://www.ted.com/talks/view/id/484 !
- 20. Introduction Example: BIO2RDF Peter Ansell, Model and prototype for querying multiple linked scientific datasets, Future Generation Computer Systems, Volume 27, Issue 3, March 2011, Pages 329-333
- 21. Introduction data.gov and data.gov.uk
- 24. Introduction Semantic Web “layer cake” Standardized Under Investigation Already Possible [ source http://www.w3.org/2007/03/layerCake.png ]
- 49. Query: SPARQL
- 52. SPARQL in a nutshell Anatomy of a SPARQL query
- 53. SPARQL in a nutshell Anatomy of a SPARQL SELECT query
- 69. Ontology: RDF-S and OWL
- 71. RDF-S/OWL in a nutshell What does it mean? Formal, explicit specification of a shared conceptualization Machine readable Several people agrees that such conceptual model is adequate to describe such aspects of the reality A conceptual model of some aspects of the reality It makes domain assumption explicit
- 73. RDF-S/OWL in a nutshell How much explicit shall the specification be ? “ A little semantics, goes a long way” [James Hendler, 2001] Advanced
- 74. RDF-S/OWL in a nutshell A simple ontology Artist Piece Painter Paint paints Sculptor Sculpt sculpts creates
- 78. RDF-S/OWL in a nutshell The ontology we specified Artist Piece Painter Paint paints Sculptor Sculpt sculpts creates
- 101. Advertisement ;-)
Notas del editor
- 05/04/11 © 2005 - Della Valle - CEFRIEL
- 05/04/11 © 2005 - Della Valle - CEFRIEL
- 05/04/11 © 2005 - Della Valle - CEFRIEL
- PREFIX skos: <http://www.w3.org/2004/02/skos/core#> PREFIX dbpedia: <http://dbpedia.org/resource/> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> PREFIX category: <http://dbpedia.org/resource/Category:> select ?s ?p where { ?s a dbpedia-owl:Drug ; skos:subject category:Anxiolytics ; ?p dbpedia:Kidney . } http://dbpedia.org/isparql/view/?query=PREFIX%20skos%3A%20%3Chttp%3A%2F%2Fwww.w3.org%2F2004%2F02%2Fskos%2Fcore%23%3E%0APREFIX%20dbpedia%3A%20%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2F%3E%20%0APREFIX%20dbpedia-owl%3A%20%3Chttp%3A%2F%2Fdbpedia.org%2Fontology%2F%3E%20%0APREFIX%20category%3A%20%3Chttp%3A%2F%2Fdbpedia.org%2Fresource%2FCategory%3A%3E%20%0A%0Aselect%20%3Fs%20%3Fp%20%0Awhere%20%7B%20%3Fs%20a%20dbpedia-owl%3ADrug%20%3B%0A%20%20%20%20%20%20%20%20skos%3Asubject%20category%3AAnxiolytics%20%3B%0A%20%20%20%20%20%20%20%20%3Fp%20dbpedia%3AKidney%20.%20%7D%0A%20&endpoint=/sparql&maxrows=50&default-graph-uri=http://dbpedia.org
- PREFIX skos: <http://www.w3.org/2004/02/skos/core#> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> SELECT ?drug ?category WHERE { ?drug a dbpedia-owl:Drug ; skos:subject ?category . }
- PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> SELECT ?drug WHERE { ?drug a dbpedia-owl:Drug ; rdfs:label &quot;Budesonide&quot; . }
- PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX dbpprop: <http://dbpedia.org/property/> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> SELECT ?drug WHERE { ?drug a dbpedia-owl:Drug ; dbpprop:chemspiderid &quot;4777&quot; ^^xsd:integer . }
- PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> PREFIX dbpprop: <http://dbpedia.org/property/> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> SELECT ?drug ?mp WHERE { ?drug a dbpedia-owl:Drug ; dbpprop:meltingPoint ?mp . FILTER ( ?mp < 30 ) }
- PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#> PREFIX dbpedia-owl: <http://dbpedia.org/ontology/> SELECT ?drug ?c WHERE { ?drug a dbpedia-owl:Drug ; rdfs:comment ?c . FILTER( regex(?c, &quot;Asthma&quot;, &quot;i&quot;)) }
- <RDF> <Description about=&quot;Rodin&quot;> <sculpts resource=&quot;TheKiss&quot;/> </Description> <Description about=&quot;Painting&quot;> <subClassOf resource=&quot;Piece&quot;/> </Description> <Description about=&quot;sculpts&quot;> <range resource=&quot;Sculpt&quot;/> <domain resource=&quot;Sculptor&quot;/> <subPropertyOf resource=&quot;creates&quot;/> </Description> <Description about=&quot;Sculpt&quot;> <subClassOf resource=&quot;Piece&quot;/> </Description> <Description about=&quot;creates&quot;> <range resource=&quot;Piece&quot;/> <domain resource=&quot;Artist&quot;/> </Description> <Description about=&quot;Sculptor&quot;> <subClassOf resource=&quot;Artist&quot;/> </Description> <Description about=&quot;Painter&quot;> <subClassOf resource=&quot;Artist&quot;/> </Description> </RDF> RDF/Description[@about='Rodin']/sculpts/@resource RDF/Description[sculpts/@resource='TheKiss']/@about