POWDERPOWDERin a nutshellin a nutshell

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fabien, gandon, inria

for Web for Web Description Description ResourcesResources

description resourcedescription resource• a description

• its scope

• its own metadata(creation, creator, etc.)

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without retrievingwithout retrievingthe resource(s)the resource(s)

information about web resource(s)

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tailored web tailored web experience throughcustomized content

personalized delivery

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two flavourstwo flavoursPOWDERPOWDERloose, human-readable XML

primary exchange mechanism

POWDER-SPOWDER-S

harness semantic web

optional

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transformPOWDER

GRDDLGRDDL

POWDER-S

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groupsgroups of online resourcesdescriptions applied to

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onedescription

many resources

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grouping mechanisms...

... list URIs

... domain names, paths

... regular expressions on URIs

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descriptionsmay be grouped

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queriesare on individual resources

descriptiondescription……• 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??

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in order to...

trust

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protectauthorize

adapt

searchmonitor

POWDER documentPOWDER document<?xml version="1.0"?><powder xmlns="http://www.w3.org/2007/05/powder#"<powder xmlns="http://www.w3.org/2007/05/powder#" xmlns:ex="http://example.org/vocab#"> <attribution> <issuedby src="http://ns.inria.fr/fabien.gandon/foaf#me" /> <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="http://inria.fr/icon.png" /> </descriptorset> </dr></powder></powder>

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attribution of descriptionattribution of description<?xml version="1.0"?><powder xmlns="http://www.w3.org/2007/05/powder#" xmlns:ex="http://example.org/vocab#"> <attribution> <attribution> <issuedby src=" <issuedby src="http://ns.inria.fr/fabien.gandon/foaf#mehttp://ns.inria.fr/fabien.gandon/foaf#me" />" /> <issued>2008-09-01T10:30:00</issued> <issued>2008-09-01T10:30:00</issued> </attribution> </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="http://inria.fr/icon.png" /> </descriptorset> </dr></powder>

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scope of descriptionscope of description<?xml version="1.0"?><powder xmlns="http://www.w3.org/2007/05/powder#" xmlns:ex="http://example.org/vocab#"> <attribution> <issuedby src="http://ns.inria.fr/fabien.gandon/foaf#me" /> <issued>2008-09-01T10:30:00</issued> </attribution> <dr> <iriset> <iriset> <includehosts>inria.fr</includehosts> <includehosts>inria.fr</includehosts> <includepathstartswith>/sophia/</includepathstartswith> <includepathstartswith>/sophia/</includepathstartswith> </iriset></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="http://inria.fr/icon.png" /> </descriptorset> </dr></powder>

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descriptorsdescriptors<?xml version="1.0"?><powder xmlns="http://www.w3.org/2007/05/powder#" xmlns:ex="http://example.org/vocab#"> <attribution> <issuedby src="http://ns.inria.fr/fabien.gandon/foaf#me" /> <issued>2008-09-01T10:30:00</issued> </attribution> <dr> <iriset> <includehosts>inria.fr</includehosts> <includepathstartswith>/sophia/</includepathstartswith> </iriset> <descriptorset> <descriptorset> <ex:city>Sophia Antipolis</ex:city> <ex:city>Sophia Antipolis</ex:city> <ex:country>France</ex:country> <ex:country>France</ex:country> <displaytext>Everything on inria.fr/sophia/ is located <displaytext>Everything on inria.fr/sophia/ is located in Sophia Antipolis, France</displaytext> in Sophia Antipolis, France</displaytext> <displayicon src="http://inria.fr/icon.png" /> <displayicon src="http://inria.fr/icon.png" /> </descriptorset> </descriptorset> </dr></powder>

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in other words...in other words...

the 2008-09-012008-09-01 at 10:3010:30 the person identified byhttp://ns.inria.fr/fabien.gandon/foaf#mehttp://ns.inria.fr/fabien.gandon/foaf#me

said that resources with URIs such ashttp://www.inria.fr/sophia/inria.fr/sophia/blabla

had the properties:city = Sophia Antipoliscity = Sophia Antipoliscountry = Francecountry = France

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publishingpublishingin HTML header<head profile="http://www.w3.org/2007/11/powder-profile">

<link rel="powder" href="powder.xml" type="application/xml"/>

in HTTP response header (works for all resources)Link: <powder.xml>; rel="powder" type="application/xml";

In HTML body with RDFa <a href="/audio/conference52.mp3"

rev="wdrs:describedby"

about="/powder.xml">I. Herman</a>

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authenticateauthenticatethe descriptions and

the claims

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Allow different methods of Allow different methods of adding trustadding 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.

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in a nutshell…

descriptions of

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groups of resources

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remote access to descriptionswithout retrieving thedescribed resources

tailor content and delivery to users and context

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propertiesto assist trust

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fabien, gandon