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    <p>As far as I know there is not such stuff as per the SOAP/WSDL standard. But tools exists to cope with such issues. For instance, in Glassfish you can specify <strong>XSL</strong> stylesheet to transform the request/response of a web service. Other solution such as Oracle SOA suite offer much more elaborated tools to manage versioning of web service and integration of component together. Message can be <strong>routed</strong> automatically to different version of a web service and/or <strong>transformed</strong>. You will need to check what your target infrastructure offers.</p> <p><strong>EDIT</strong>:</p> <p>XML and XSD is more flexible regarding evolution of the schema than types and serialization in object-oriented languages. Some stuff can be made backward compatible by simply declaring them as optional, e.g.</p> <ul> <li><em>Adding parameters to existing functions</em> - if a parameter is optional, you get a <code>null</code> value if the client doesn't send it</li> <li><em>Adding variables to existing structure that are used in existing functions</em> - if the value is optional, you get <code>null</code> if the client doesn't provide it</li> <li><em>Removing functions</em> - no magic here</li> <li><em>Removing parameters from existing functions</em> - parameters sent by the client will be superfluous according to the new definition and will be omitted</li> <li><em>Removing variables from existing structure that are used in existing functions</em> - I don't know in this case</li> <li><em>Changing the type of a parameter used in an existing function</em> - that depends on the change. For a simple type the serialization/deserialization may still work, e.g. String to int.</li> </ul> <p>Note that I'm not 100% sure of the list. But a few tests can show you what works and what doesn't. The point is that XML is sent over the wire, so it gives some flexibility. </p>
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    1. POCan an API in SOAP/WSDL be kept backwards compatible easily?
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    1. POCan an API in SOAP/WSDL be kept backwards compatible easily?
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    1. CO"no magic here": You're right :D
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      1. USDimitri C.
    2. COThanks a lot for your answer! However, I suddenly realized I forgot to mention two additional cases: renaming functions and renaming parameters. Do you know what happens in those cases?
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    3. COIn this case the XML will be incompatible, so it won't work. I think you will need to transform the message, e.g. with XSLT.
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