Cloudware Technologies - Guide to Cloud Computing for Business and Technology Managers - page 321

Language (WS-CDL), which specifies the common observable
behavior of all participants engaged in business collaboration.
Each participant could be implemented not only by BPEL but
also by other executable business process languages.

c. Coordination/transaction standards: Solving the problems asso-

ciated with service discovery and service description retrieval is
the key to success of Web Services. Currently, there are attempts
underway toward defining transactional interaction among Web
Services. The WS-Coordination and WS-Transaction initiatives
complement BPEL to provide mechanisms for defining specific
standard protocols for use by transaction processing systems,
workflow systems, or other applications that wish to coordinate
multiple Web Services. These three specifications work in tan-
dem to address the business workflow issues implicated in con-
necting and executing a number of Web Services that may run
on disparate platforms across organizations involved in e-busi-
ness scenarios.

There are several vendors including companies such as IBM,
Microsoft, BEA, and Sun Microsystems that supply products
and services across the realm of Web Services functionality and
implement Web Services technology stack. These vendors are
considered as platform providers and provide both infrastructure, for
example, WebSphere, .NET framework, and WebLogic, for building
and deploying Web Services in the form of application servers and
tools for orchestration and/or composite application development for
utilizing Web Services within business operations.

15.5 Quality of Service (QoS)
The QoS offered by a Web Service is becoming the highest priority for ser-
vice providers and their customers. QoS refers to the ability of the Web
Service to respond to expected invocations and to perform them at the level
commensurate with the mutual expectations of both its provider and its
customers. Several quality factors that reflect customer expectations, such
as constant service availability, connectivity, and high responsiveness,
become key to keeping a business competitive and viable as they can have a
serious impact upon service provision. QoS thus becomes an important cri-
terion that determines the service usability and utility, both of which influ-
ence the popularity of a particular Web Service, and an important selling