NDLI: Service Contract Template

Content Provider	IEEE Xplore Digital Library
Author	Simon, A. Rischbeck, T.
Copyright Year	2006
Description	Author affiliation: Innovation Process Technol. Inc. (Simon, A.; Rischbeck, T.)
Abstract	Summary form only given. Loose coupling is a cornerstone for service-oriented architecture (SOA). Service contracts enable loose coupling, because they hide service-internal details from the outside world behind a facade. In the Web services world, the service contract is commonly understood as a WSDL document possibly decorated with WS-policy annotations. Such formal XML description is not immediately useful to business people. This paper proposes the notion of a service metadata document that contains human-readable business aspects of the service in addition to technical artifacts. Stakeholders at the business and technical level work collaboratively on the service metadata document and use it as a common framework for discussion. We see the service contract as a composition of functional metadata and a set of policies, such as security constraints, access restrictions for user groups, transport and service level agreements, charging, etc. For example, enterprises often have different security requirements when a service is consumed from within the company than when it is consumed by an external business partner. The service lifecycle is initiated by business people on the basis of a service contract template; the first step is a high-level description of the desired service characteristics. In an iterative process the document is then successively refined as it percolates from the management level to service architect and other stakeholders and as business requirements are tested against technical realities. Technical artifacts (WSDL, XSD, etc.) are added to the service contract and could be placed in a registry so that the service is visible to other departments or external partners. The clear distinction between service metadata and policies also helps maintaining a consistent model over runtime WSDL proliferation. Typically, policies are enforced by intermediaries, such as XML firewalls, enterprise service bus (ESB) or other WS-infrastructure. Each such intermediary offers a virtual service endpoint to the actual service implementation. Because different policies may be enforced at each endpoint and because of the different locations, the WSDL for each of these virtual service endpoints is different
Sponsorship	IEEE CPS
Starting Page	511
Ending Page	511
File Size	74167
Page Count	1
File Format	PDF
ISBN	0769526705
DOI	10.1109/SCC.2006.89
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-09-18
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Contracts Service oriented architecture XML Security Web services Collaborative work Online Communities/Technical Collaboration Companies Testing Runtime
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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