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what is difference between top down and bottom up approach in soap web services?

Top down approach:
In case of top down approach WSDL document is created first to establish the contract between web service and client, after that the code is written. This approach is also known as contract first approach.
It is difficult to implement because any thing we develop in the code should be confirmed against the already existing contract.

Bottom up approach:
In case of bottom up approach web services are developed first and then WSDL is generated based on web service code. This approach is also known as contract last approach.

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