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POWDER in a Nutshell
 

POWDER in a Nutshell

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tutorial built from the primer of POWDER at W3C

tutorial built from the primer of POWDER at W3C

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    POWDER in a Nutshell POWDER in a Nutshell Presentation Transcript

    • POWDER
      • in a nutshell
      fabien, gandon, inria
    • for Web Description Resources
    • description resource
      • a description
      • its scope
      • its own metadata (creation, creator, etc.)
    • without retrieving the resource(s)
      • information about web resource(s)
    • tailored web
      • experience through customized content personalized delivery
    • two flavours
      • POWDER loose, human-readable XML
      • primary exchange mechanism
      • POWDER-S
      • harness semantic web
      • optional
    • transform
      • POWDER
      • GRDDL
      • POWDER-S
    • groups of online resources
      • descriptions applied to
    • one description
      • many resources
    • grouping mechanisms...
      • ... list URIs
      • ... domain names, paths
      • ... regular expressions on URIs
    • descriptions
      • may be grouped
      queries are on individual resources
    • description …
      • Which resources does the DR describe ?
      • What is the description ?
      • Who has created the description ?
      • When was the description created ?
      • Until when is the description considered valid ?
      • From when is the description considered valid ?
      • Does anybody agree with this description ?
      • Do other descriptions exist about this group of resources ?
    • in order to...
      • trust
      protect authorize adapt search monitor
    • POWDER document
      • <?xml version=&quot;1.0&quot;?> <powder xmlns=&quot;http://www.w3.org/2007/05/powder#&quot; xmlns:ex=&quot;http://example.org/vocab#&quot;> <attribution> <issuedby src=&quot; http://ns.inria.fr/fabien.gandon/foaf#me &quot; /> <issued>2008-09-01T10:30:00</issued> </attribution> <dr> <iriset> <includehosts>inria.fr</includehosts> <includepathstartswith>/sophia/</includepathstartswith>
      • </iriset> <descriptorset> <ex:city>Sophia Antipolis</ex:city> <ex:country>France</ex:country> <displaytext>Everything on inria.fr/sophia/ is located in Sophia Antipolis, France</displaytext> <displayicon src=&quot; http://inria.fr/icon.png &quot; /> </descriptorset> </dr> </powder>
    • attribution of description
      • <?xml version=&quot;1.0&quot;?> <powder xmlns=&quot;http://www.w3.org/2007/05/powder#&quot; xmlns:ex=&quot;http://example.org/vocab#&quot;> <attribution> <issuedby src=&quot; http://ns.inria.fr/fabien.gandon/foaf#me &quot; /> <issued>2008-09-01T10:30:00</issued> </attribution> <dr> <iriset> <includehosts>inria.fr</includehosts> <includepathstartswith>/sophia/</includepathstartswith>
      • </iriset> <descriptorset> <ex:city>Sophia Antipolis</ex:city> <ex:country>France</ex:country> <displaytext>Everything on inria.fr/sophia/ is located in Sophia Antipolis, France</displaytext> <displayicon src=&quot; http://inria.fr/icon.png &quot; /> </descriptorset> </dr> </powder>
    • scope of description
      • <?xml version=&quot;1.0&quot;?> <powder xmlns=&quot;http://www.w3.org/2007/05/powder#&quot; xmlns:ex=&quot;http://example.org/vocab#&quot;> <attribution> <issuedby src=&quot; http://ns.inria.fr/fabien.gandon/foaf#me &quot; /> <issued>2008-09-01T10:30:00</issued> </attribution> <dr> <iriset> <includehosts>inria.fr</includehosts> <includepathstartswith>/sophia/</includepathstartswith>
      • </iriset> <descriptorset> <ex:city>Sophia Antipolis</ex:city> <ex:country>France</ex:country> <displaytext>Everything on inria.fr/sophia/ is located in Sophia Antipolis, France</displaytext> <displayicon src=&quot; http://inria.fr/icon.png &quot; /> </descriptorset> </dr> </powder>
    • descriptors
      • <?xml version=&quot;1.0&quot;?> <powder xmlns=&quot;http://www.w3.org/2007/05/powder#&quot; xmlns:ex=&quot;http://example.org/vocab#&quot;> <attribution> <issuedby src=&quot; http://ns.inria.fr/fabien.gandon/foaf#me &quot; /> <issued>2008-09-01T10:30:00</issued> </attribution> <dr> <iriset> <includehosts>inria.fr</includehosts> <includepathstartswith>/sophia/</includepathstartswith>
      • </iriset> <descriptorset> <ex:city>Sophia Antipolis</ex:city> <ex:country>France</ex:country> <displaytext>Everything on inria.fr/sophia/ is located in Sophia Antipolis, France</displaytext> <displayicon src=&quot;http://inria.fr/icon.png&quot; /> </descriptorset> </dr> </powder>
    • in other words...
      • the 2008-09-01 at 10:30 the person identified by http://ns.inria.fr/fabien.gandon/foaf#me
      • said that resources with URIs such as http://www. inria.fr/sophia/ blabla
      • had the properties: city = Sophia Antipolis country = France
    • publishing
      • in HTML header
      • <head profile=&quot;http://www.w3.org/2007/11/powder-profile&quot;> <link rel=&quot;powder&quot; href=&quot;powder.xml&quot; type=&quot;application/xml&quot;/>
      • in HTTP response header (works for all resources)
      • Link: <powder.xml>; rel=&quot;powder&quot; type=&quot;application/xml&quot;;
      • In HTML body with RDFa
      • <a href=&quot;/audio/conference52.mp3&quot;
      • rev=&quot;wdrs:describedby&quot;
      • about=&quot;/powder.xml&quot; >I. Herman</a>
    • authenticate
      • the descriptions and the claims
    • Allow different methods of adding trust
      • well-known content provider
      • link to authentication mechanisms
      • validity and issue date information
      • certification by trusted third parties
      • XML signature, web of trust, etc.
    • in a nutshell …
      • descriptions of
      groups of resources
    • remote access to descriptions
      • without retrieving the described resources
    • tailor
      • content and delivery to users and context
    • properties
      • to assist trust