University of Montréal (Canada)
Specifying and analyzing web service descriptions
CADP (Construction and Analysis of Distributed Processes)
Web services are emerging as a key infrastructure for providing
inter-operation between applications and systems and for providing
support for the deployment of e-commerce business processes. One
important issue for ensuring the growth of Web services is having
ways of describing the available Web services in a precise way. One
possible step towards providing semantic information for Web services
is through the use of formal contract specifications based on
The use of pre/post-conditions, however, is not sufficient to describe the semantic of a group of related operations, for example, to describe the legal sequences in which these operations can/should be used. Although business process description languages like BPEL4WS or WSCI can express such descriptions, these are procedural descriptions, not necessarily appropriate for specification purpose. We present one possible way in which such descriptions could be provided for Web services, using path expressions that can show the order in which the various operations of a Web service can and should be invoked.
The Web service descriptions extended with path expressions can be formally verified by developing a connection to a state-of-the-art verification toolbox such as CADP. This connection could work in the following way:
Existing formal specification and verification technology can provide
a useful way of analyzing Web services, by developing appropriate
connections between Web service description languages and process
algebraic languages. The development of Web services could also
benefit from the same kind of conceptual tools, such as
contracts, available in other areas of software development.
Guy Tremblay and Junghyun Chae.
"Toward Specifying Contracts and Protocols for Web Services".
In Rachida Dssouli and Hadedh Mili, editors, Proceedings of the
1st Montréal Conference on e-Technologies MCeTech'2005
(Montréal, Canada), IEEE Computer Society Press, pp. 73-85,
Full version available on-line from http://www.info2.uqam.ca/~tremblay/TremblayCha05.pdf
or from our FTP site in PDF or PostScript
[Mili-Tremblay-Obaid-Tamrout-Caillot-05] Hafedh Mili, Guy Tremblay, Abdel Obaid, Radhouane Ben Tamrout, and Elisabeth Caillot. "Adding Semantics to Web Service Descriptions". Technical report, Université de Québec à Montréal, February 2005.
Full version available from our FTP site in PDF or PostScript
Université du Québec à Montréal
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Montréal, QC, H3C 3P8, Canada
Tel: (514) 987-3000, poste 8213
Fax: (514) 987-8477
|Further remarks:||This tool, amongst others, is described on the CADP Web site: http://cadp.inria.fr/software|