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The basic plumbing consists of XML, SOAP,WSDL,UDDI,HTTP(tcp/smpt)
The refined version of the logic that resides in the data tier ,business rules tier and presentation tier shows that the presentation tier is now said to consist of web services and the windows and web UI.
If all are present on a single box a business façade is said to describe the middle, on more than one box then business rules collectively describes the reality that may underpin the architecture.
Generally web service types can be described as either simple, application integration, or framework