POWDER in a Nutshell

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="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> <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>

attribution of description

scope of description

descriptors
</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>

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="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>

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

http://kurapov.name	3354
http://fabien-gandon.blogspot.com	46
http://www-sop.inria.fr	46
http://www.slideshare.net	7
http://fabien-gandon.blogspot.fr	3

POWDER in a Nutshell

by Fabien Gandon on Aug 30, 2008

Accessibility

Categories

Tags

Upload Details

Usage Rights

5 Embeds 3,456

Statistics

POWDER in a Nutshell — Presentation Transcript