POWDER in a nutshell fabien, gandon, inria

in a nutshell

for Web Description Resources

description resource a description its scope its own metadata (creation, creator, etc.)

a description

its scope

its own metadata (creation, creator, etc.)

without retrieving the resource(s) information about web resource(s)

information about web resource(s)

tailored web experience through customized content personalized delivery

experience through customized content personalized delivery

two flavours POWDER loose, human-readable XML primary exchange mechanism POWDER-S harness semantic web optional

POWDER loose, human-readable XML

primary exchange mechanism

POWDER-S

harness semantic web

optional

transform POWDER GRDDL POWDER-S

POWDER

GRDDL

POWDER-S

groups of online resources descriptions applied to

descriptions applied to

one description many resources

many resources

grouping mechanisms... ... list URIs ... domain names, paths ... regular expressions on URIs

... list URIs

... domain names, paths

... regular expressions on URIs

descriptions may be grouped queries are on individual resources

may be grouped

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 ?

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

trust

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>

<?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>

<?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>

<?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>

<?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

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>

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

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.

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

descriptions of

remote access to descriptions without retrieving the described resources

without retrieving the described resources

tailor content and delivery to users and context

content and delivery to users and context

properties to assist trust

to assist trust