Maintaining knowledge about temporal intervals
Communications of the ACM
A software framework for matchmaking based on semantic web technology
WWW '03 Proceedings of the 12th international conference on World Wide Web
UDDIe: An Extended Registry for Web Services
SAINT-W '03 Proceedings of the 2003 Symposium on Applications and the Internet Workshops (SAINT'03 Workshops)
Semantics in Service Discovery and QoS Measurement
IT Professional
Semantic WS-agreement partner selection
Proceedings of the 15th international conference on World Wide Web
Towards Unified QoS/SLA Ontologies
SCW '06 Proceedings of the IEEE Services Computing Workshops
Contract-based load management in federated distributed systems
NSDI'04 Proceedings of the 1st conference on Symposium on Networked Systems Design and Implementation - Volume 1
SLA-Driven Clustering of QoS-Aware Application Servers
IEEE Transactions on Software Engineering
Management applications of the Web Service Offerings Language (WSOL)
Information Systems - Special issue: The 15th international conference on advanced information systems engineering (CAiSE 2003)
An approach to modeling Web service QoS and provision price
WISEW'03 Proceedings of the Fourth international conference on Web information systems engineering workshops
A concept for QoS integration in web services
WISEW'03 Proceedings of the Fourth international conference on Web information systems engineering workshops
An approach to temporal-aware procurement of web services
ICSOC'05 Proceedings of the Third international conference on Service-Oriented Computing
What’s in an agreement?an analysis and an extension of WS-Agreement
ICSOC'05 Proceedings of the Third international conference on Service-Oriented Computing
Study on qos driven web services composition
APWeb'06 Proceedings of the 8th Asia-Pacific Web conference on Frontiers of WWW Research and Development
Proceedings of the 3rd international workshop on Services integration in pervasive environments
An Initial Approach to Explaining SLA Inconsistencies
ICSOC '08 Proceedings of the 6th International Conference on Service-Oriented Computing
Temporal-Awareness in SLAs: Why Should We Be Concerned?
Service-Oriented Computing - ICSOC 2007 Workshops
WISE '09 Proceedings of the 10th International Conference on Web Information Systems Engineering
Explaining the Non-compliance between Templates and Agreement Offers in WS-Agreement
ICSOC-ServiceWave '09 Proceedings of the 7th International Joint Conference on Service-Oriented Computing
An offer generation approach to SLA negotiation support in service oriented computing
Service Oriented Computing and Applications
Using automated analysis of temporal-aware SLAs in logistics
ICSOC/ServiceWave'09 Proceedings of the 2009 international conference on Service-oriented computing
Review: A framework for awareness maintenance
Journal of Network and Computer Applications
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WS-Agreement (WS-Ag) is a proposed recommendation of the Open Grid Forum that provides a schema to describe SLAs and a protocol to create them based on a mechanism of templates. However, although it identifies the necessity of specifying temporal-aware agreement terms (e.g. the response time is 30 ms from 8:00h to 17:00h and 15 ms from 17:00h to 8:00h), to the best of our knowledge, there are no existing proposals that deal with that necessity. We propose an extension that gives WS-Ag support to temporality. This allows describing expressive validity periods such as those composed by several periodic or non-periodic intervals and it applies not only to the agreement terms themselves but also to other parts of WS-Ag such as creation constraints and preferences about the service properties. In addition, in this paper we propose a preference XML schemato describe preferences over any set of service properties using any kind of utility function. In further research we will study a concrete specification for those utility functions.