as opposed to the traditionally fragmented markets
for software components (e.g., where EJBs can not be easily mixed
with .NET assemblies). This has also led to the emergence of a large number of languages and tools specifically targeting the composition
of WS-* services out of already existing ones (e.g., WSBPEL
[29], JOpera [31], or XL [15]).
Given their lack of formally described interfaces and the possibility
of not always using XML messages, RESTful Web services
are cumbersome to compose using the WSDL-based invocation
abstractions provided by WS-BPEL [30]. The composition
of RESTful Web services is the main focus of so-called Web 2.0
Mashups, which are seen as a welcome improvement over screenscraping
the information to be composed out of traditional HTML
Web sites
as opposed to the traditionally fragmented markets
for software components (e.g., where EJBs can not be easily mixed
with .NET assemblies). This has also led to the emergence of a large number of languages and tools specifically targeting the composition
of WS-* services out of already existing ones (e.g., WSBPEL
[29], JOpera [31], or XL [15]).
Given their lack of formally described interfaces and the possibility
of not always using XML messages, RESTful Web services
are cumbersome to compose using the WSDL-based invocation
abstractions provided by WS-BPEL [30]. The composition
of RESTful Web services is the main focus of so-called Web 2.0
Mashups, which are seen as a welcome improvement over screenscraping
the information to be composed out of traditional HTML
Web sites
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