Rdf In A Nutshell V1
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Rdf In A Nutshell V1



Tutorial on RDF (version 1)

Tutorial on RDF (version 1)



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Rdf In A Nutshell V1 Rdf In A Nutshell V1 Presentation Transcript

  • R D F in a nutshell fabien, gandon, inria
  • humans
    • the web to
  • Sacks Oliver Oliver Sacks The Man Who Mistook His Wife for a Hat : And Other Clinical Tales by In his most extraordinary book, "one of the great clinical writers of the 20th century" ( The New York Times ) recounts the case histories of patients lost in the bizarre, apparently inescapable world of neurological disorders. Oliver Sacks's The Man Who Mistook His Wife for a Hat tells the stories of individuals afflicted with fantastic perceptual and intellectual aberrations: patients who have lost their memories and with them the greater part of their pasts; who are no longer able to recognize people and common objects; who are stricken with violent tics and grimaces or who shout involuntary obscenities; whose limbs have become alien; who have been dismissed as retarded yet are gifted with uncanny artistic or mathematical talents. If inconceivably strange, these brilliant tales remain, in Dr. Sacks's splendid and sympathetic telling, deeply human. They are studies of life struggling against incredible adversity, and they enable us to enter the world of the neurologically impaired, to imagine with our hearts what it must be to live and feel as they do. A great healer, Sacks never loses sight of medicine's ultimate responsibility: "the suffering, afflicted, fighting human subject." Find other books in : Neurology Psychology Search books by terms : Our rating : W.
  • machines
    • the same web to
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  • machines
    • the semantic web is an extension to add to the web some metadata for
  • RDF
    • is the first layer of the semantic web standards
  • RDF
    • stands for R esource D escription F ramework
  • RDF
    • stands for R esource: pages, images, videos , ... everything that can have a URI D escription: attributes, features, and relations of the resources F ramework: model, languages and syntaxes for these descriptions
  • comes in three
    • in RDF knowledge always
  • R D F
    • is a triple model i.e. every piece of knowledge is broken down into
    • ( subject , predicate , object )
  • knowledge
    • take for instance the following piece of
  • doc.html has for author Fabien and has for theme Music
  • doc.html has for author Fabien doc.html has for theme Music
  • ( doc.html , author , Fabien ) ( doc.html , theme , Music ) ( subject , predicate , object )
  • R D F
    • in the atoms of knowledge are triples of the form ( subject , predicate , object )
  • a triple the RDF atom Predicate Subject Object
  • RDF
    • is also a graph model to link the descriptions of resources
  • RDF
    • triples can be seen as arcs of a graph ( vertex , edge , vertex )
  • ( doc.html , author , Fabien ) ( doc.html , theme , Music )
  • Fabien author doc.html theme Music
  • R D F
    • in resources and properties are identified by URIs
  • http://inria.fr/~fabien#me http://inria.fr/schema#author http://inria.fr/rr/doc.html http://inria.fr/schema#theme Music
  • R D F
    • in values of properties can also be literals i.e. strings of characters
  • ( doc.html , author , Fabien ) ( doc.html , theme , &quot;Music&quot; )
  • http://inria.fr/~fabien#me http://inria.fr/schema#author http://inria.fr/rr/doc.html http://inria.fr/schema#theme &quot;Music&quot;
  • R D F
    • in literal values of properties can also be typed with XML datatypes
  • doc.html has for author Fabien and has 192 pages
  • http://inria.fr/~fabien#me http://inria.fr/schema#author http://inria.fr/rr/doc.html http://inria.fr/schema#nbPages &quot;192&quot;^^ xsd:integer
  • nodes RDF allows blank
  • anonymous a resource may be i.e. not identified by a URI and noted _: xyz
  • e.g., there exists a report about Music
  • http://inria.fr/schema#Report rdf:type _:x http://inria.fr/schema#theme &quot;Music&quot;
    • <rdf:RDF xmlns:rdf=&quot;http://www.w3.org/1999/02/22-rdf-syntax-ns#&quot; xmlns:inria=&quot;http://inria.fr/schema#&quot; >
    • <inria:Report>
    • <inria:theme> Music </inria:theme>
    • </inria:Report>
    • </rdf:RDF>
  • break blank nodes the graph, they cannot be reused
  • name your resources and reuse existing names as much as possible
  • R D F
    • < /> has an XML syntax
  • away
    • don't run
    • <rdf:RDF xmlns:rdf=&quot;http://www.w3.org/1999/02/22-rdf-syntax-ns#&quot; xmlns:inria=&quot;http://inria.fr/schema#&quot; >
    • <rdf:Description rdf:about=&quot;http://inria.fr/rr/doc.html&quot;>
    • <inria:author rdf:resource= &quot; http://inria.fr/~fabien#me &quot; />
    • <inria:theme> Music </inria:theme>
    • </rdf:Description>
    • </rdf:RDF>
  • ma chi nes
    • it's only for
  • R D F a
    • is a syntax to mix RDF and HTML inside one web page.
  • R D F a
    • stands for R D F in HTML attributes
  • R D F
    • has other syntaxes such as N3, Turtle and N-Triples.
  • R D F
    • provides a primitive to give one or more types to a resource.
  • ( doc.html , rdf:type , Report )
  • http://inria.fr/schema#Report rdf:type http://inria.fr/rr/doc.html
  • open-world assumption as opposed to the closed world assumption of classical systems
  • in short: the absence of a triple is not significant
  • ( doc.html , author , Fabien )
    • doesn't mean doc.html has one author
  • ( doc.html , author , Fabien )
    • means doc.html has at least one author
  • if you have no other triples giving authors it does not mean they are not true .
  • R D F
    • provides primitives to build containers and collections to list things
  • R D F
    • containers are open, contain resources or literals, possibly duplicate,
    • rdf:Bag for unordered resources rdf:Seq for ordered resources rdf:Alt for alternative (values)
  • R D F
    • collections are closed lists of resources or literals, possibly duplicate
    • rdf:List to start the list rdf:first and rdf:rest to list rdf:nil to end the list
  • doc.html has for chapters : 1, Classical 2, Pop 3, Rock
  • ( doc.html , hasChapter , _:a ) ( _:a , rdf:first , Classical ) ( _:a , rdf:rest , _:b ) ( _:b , rdf:first , Pop ) ( _:b , rdf:rest , _:c ) ( _:c , rdf:first , Rock ) ( _:c , rdf:rest , rdf:nil )
  • R D F about R D F
    • reification of statements to allow
    • statements about statements.
  • Fabien says &quot; doc.html has for theme Music &quot;
  • ( Fabien , say , triple87 ) ( triple87 , rdf:subject , doc.html ) ( triple87 , rdf:predicate , theme ) ( triple87 , rdf:object , &quot; Music &quot; ) ( triple87 , rdf:type , rdf:Statement )
  • R D F
    • provides primitives to give structured values to properties e.g., to give values with units
  • doc.html has for length 262144 characters
  • ( doc.html , length , _:a ) ( _:a , rdf:value , &quot;262144&quot; ) ( _:a , units , characters )
  • take home summary
  • RDF is a triple model to add metadata to the web
  • to applications
    • RDF enables you to open your data
    • through the web
  • fabien, gandon