Download Using Transactional Workflow Ontology in Agent Cooperation

Survey
yes no Was this document useful for you?
   Thank you for your participation!

* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project

Document related concepts
Transcript
Using Transactional
Workflow Ontology in
Agent Cooperation
J. Korhonen, L. Pajunen, and
J. Puustjärvi
Background

BRIEFS information extraction system
 Analyses

Transaction research in WorkMan
 Database

news articles for corporate actions
constraint used for workflow control
BriefsAgents – a multi-agent system
 Ontology
used to access information
 Built on top of BRIEFS database
Technology

Multi-agent system
(MAS)
 FIPA agent

platform
Web services
 SOAP,
WSDL, UDDI
 WSFL

DAML+OIL ontology
 DAML-S
BriefsAgents system

Multi-agent system




Ontology communication
Briefs database used for
information



FIPA-OS agent platform
Entity agents, Query
agents and Insert agent
Agent
Entity
Query
Insert
Org
Company
Deals
Deal
Person
Jobs
Entity agents as wrappers
Queries made using
several Entity agents
Problem: changes to
query protocol
Person
Workflow in Web Services
Web service offers operations
 WSDL describes operations

 lack
of expressiveness on workflows
XLANG, WSFL, and WSCL add
capabilities
 Local and global models describe
individual services and composed system

Workflow Ontology 1/2

Directs agents own workflow
 Internal

use
Describe communication protocol
 Multi-agent

Describes how to use offered services
 Dynamic

use
collaboration with unknown agents
Used to compose higher-level services
Workflow Ontology 2/2


Three entities
Message-oriented tasks
 Agents

Control links concurrent
or sequential
 Go,

and web services
fork, join, loop etc.
Data links to/from
blackboard
 Named
data
<<frame>>
Task
Task type
Transaction type
Optional
Commit operation
Abort operation
Protocol type
2
0..*
<<frame>>
Control Link
Link type
Condition
<<frame>>
Data Link
Data name
Translation
2
0..*
Transactional Workflow 1/2
Transactions add reliability to the workflow
 Different transaction models

 For
example nested, option, saga models
 May not be known beforehand for all agents

Tasks have a transaction model attribute
 Optional
does not, model may also be ’none’
 Commit operation, abort operation
Transactional Workflow 2/2

Special tasks
 Start
transaction
 End transaction


Useful for nested
transactions
End transaction
checks failures
 Call
commit/abort
Start
Go
Start
Transaction
Go
Order
Tickets
End
Transaction
Abort
Commit
Commit
Order
Abort
Order
End
Transactional workflow in MAS


Agent internal structure
Agent workflows should
be available




In FIPA terms, a WMA
Web service workflows
should be available
Dynamic negotiation of
protocols
Combined transactions

also web services
Agent Framework
WMA
Agent
Workflow engine
State engine
Web service
interface
Conclusions
Workflow ontology enables agent systems
to collaborate dynamically
 Transactional support needed in agent
systems and web services
 Agent systems integrate with web services
