Semantics and extensions of WS-Agreement

Ganna Frankova*, Daniela Malfatti, Marco Aiello

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


When having repeated interactions with a service provider, a service consumer might desire guarantees on the delivery of the service. These guarantees involve both functional and non-functional properties of the offered service over a number of invocations. When the guarantee terms are explicitly defined in a document, we talk about a service level agreement.WS-Agreement is an industry driven emerging protocol for the specification of agreements in the context of Web Services. If, on the one hand, WS-Agreement defines the XML syntax for the language and protocol, on the other hand, it gives only a vague textual overview of the intended meaning. We fill this gap by providing a formal definition of an agreement and analyzing the possible evolutions of agreements and their terms over an execution. As a result we identify a number of extensions which involve the initial negotiation, the monitoring of running agreements, and the possibility of renegotiating agreements in executions. We evaluate the proposed approach through experimentation.

Original languageEnglish
Pages (from-to)23-31
Number of pages9
JournalJournal of Software
Issue number1
Publication statusPublished - 2006
Externally publishedYes


  • Quality of Service
  • Service Level Agreement
  • Service-Oriented Computing
  • Web Services


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