A Model of Interactions about Actions for Active and Semantic Web Services

1
A Model of Interactions about Actions for
Active and Semantic Web Services
SWS _at_ ISWC 2004
Presented by Nicolas SABOURET Yasmine
CHARIF
Nicolas.Sabouret _at_ lip6.fr Yasmine.Charif _at_
lip6.fr Laboratoire d'Informatique de Paris 6
2
Plan

• Agents in the Semantic Web
• Presentation of VDL
• Interactions between Active and Semantic Web
  Services
• Ontologies and action in ASWS
• Conclusions and perspectives

3
Plan

• Agents in the Semantic Web
• Presentation of VDL
• Interactions between Active and Semantic Web
  Services
• Ontologies and action in VDL
• Conclusions and perspectives

4
Agents in the Semantic Web
question
service
answer
Human user
Semantic Web

• Semantic web for user assistance
• Actions are part of the information ? it should
  be questionable!
• Users interact and request web services
• A service queries other services
• SWS challenge for user assistance

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Plan

• Agents in the Semantic Web
• Presentation of VDL
• Interactions between Active and Semantic Web
  Services
• Ontologies and action in VDL
• Conclusions and perspectives

6
Presentation of VDL
The VDL model

• VDL is an AI-oriented language
• It aims to programme active software components
  (a.k.a. agents)
• Based on XML-tree rewriting

ltviewgt ltrunning/gt ltaddgt
ltpathgtltspeed/gtlt/pathgt ltvaluegt9lt/valuegt
lt/addgt lt/viewgt
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Presentation of VDL
Interaction model
web page
chatbox
service
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Interactions between ASWS
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Plan

• Agents in the Semantic Web
• Presentation of VDL
• Interactions between Active and Semantic Web
  Services
• Ontologies and action in VDL
• Conclusions and perspectives

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Presentation of VDL
Interactions in VDL
External events
Actions
Requests
ltsend-messagegt ltdestgt ltnamegtMikelt/namegt
lt/destgt lteventgtltstart-heat/gtlt/eventgt
lt/send-messagegt
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Interactions between ASWS
The VDL address
ltdestgt ltnamegtMikelt/namegt ltservergt
http//myserver.com lt/servergt lt/destgt

• A VDL address ltN, U, Sgt
• N The ASWS local identifier
• U Its users identifier (ASWS cookie)
• S Its servers URL

The VDL envelope
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Interactions between ASWS
Using WSDL to publish VDL agent capacities
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Interactions between ASWS
Using WSDL to publish VDL agent capacities
Recompile whenever service description is modified
generates
SOAP messages
put in
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Interactions between ASWS
Including the VDL envelope in SOAP messages
The interpreter reaches send-message
POST /microwave HTTP/1.1 Host http//www.microwav
e.com Content-Type text/xml charset"utf-8  Con
tent-Length nnnn SOAPAction http//www.microwave
.com/microwavenom ltenvEnvelope xmlnsenvgt
ltenvHeadergt ltiinteraction xmlnsigt
ltsendergtMikelt/sendergt ltreceivergtBoblt/receive
rgt lt/iinteractiongt lt/envHeadergt
ltenvBodygt ltmcook-a-plateOut xmlnsmgt
ltplate-cooked/gt lt/mcook-a-plateOutgt
lt/envBodygt lt/evnEnvelopegt
ltsend-messagegt ltdestgt ltnamegtBoblt/namegt
lt/destgt lteventgt ltplate-cooked/gt lt/eventgt
lt/send-messagegt
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Plan

• Agents in the Semantic Web
• Presentation of VDL
• Interactions between Active and Semantic Web
  Services
• Ontologies and action in VDL
• Conclusions and perspectives

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Ontologies and Actions in VDL
Ontological engagement
ltactiongt ltnamegtheatlt/namegt ltputgt
ltpathgtlttemperature/gtlt/pathgt
ltvaluegt190lt/valuegt lt/putgt lt/actiongt
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Ontologies and Actions in VDL
Action matching
send-message

• If P1P2 then A1 is replaced by ltP1 , M1? M2 gt
• If P1?P2 then A1 is replaced by ltP2 , M2??A1?gt
• If A1A2 then A1 is replaced by ltP1?P2 , M1gt

Actions refinement (by preconditions or
modications) ? Minimize WSDL change ? Toward
OWL-S ontologies
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Plan

• Agents in the Semantic Web
• Presentation of VDL
• Interactions between Active and Semantic Web
  Services
• Ontologies and action in VDL
• Conclusions and perspectives

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Conclusions Perspectives
Conclusions

• VDL, a programming model for active and semantic
  web services.
• ASWS interact with human (web pages) services
  (WSDL description).
• They send events (commands), actions and requests
  (control) about behavior, activity and
  functionning.
• Task ontology actions operational semantics
• Use UDDI repositories for service discovery.
• Produce OWL-S actions descriptions for ASWS
  automatic composition with services defined using
  other models.
• Make ASWS re-send a request to which it did not
  have answer when there is a change in its
  environment (eg. arrival of a new agent).

Perspectives
20
Thank you

• The source code of the VDL interpreter,
  demonstration about ASWS and documentation are
  available on line
• http//www-poleia.lip6.fr/sabouret/demos/