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.NET Forum / ASP.NET / Web Services / September 2006WSDL = SOAP?
When people discuss XML Web Services in the context of .NET, and they talk about their WSDL file and the like, does this infer SOAP? Or are there other XML-based web protocols besides SOAP that depend on WSDL files? WSDL aside, on the .NET platform, when people discuss XML Web Services, is SOAP typically inferred? Just asking about everyday industry conversation here. I seem to be on another page with some people, as I assume SOAP (and not REST or XML-RPC or anything else) when people put .NET and XML web services in the same sentence and don't mention their protocol. Jon > When people discuss XML Web Services in the context of .NET, and they talk > about their WSDL file and the like, does this infer SOAP? Or are there [quoted text clipped - 7 lines] > or anything else) when people put .NET and XML web services in the same > sentence and don't mention their protocol. Most XML web services use SOAP, but this is not required. The WSDL file can specify more than one transport, more than one encoding, etc. One could use encrypted and compressed binary over SMTP if needed, and you'd still specify it with a WSDL document. I don't know of any reason to use XML-RPC in new development. It was a starting point for SOAP, but SOAP has left it far behind. John > Most XML web services use SOAP, but this is not required. The WSDL file > can specify more than one transport, more than one encoding, etc. One > could use encrypted and compressed binary over SMTP if needed, and you'd > still specify it with a WSDL document. SMTP? But then what is the 'W' in WSDL? I'm familiar with WSDL enough to have my own opinion but would you say that WSDL is, in function / purpose, akin to a DTD / schema but specifically for transport / deserialization? Jon >> When people discuss XML Web Services in the context of .NET, and they >> talk about their WSDL file and the like, does this infer SOAP? Or are [quoted text clipped - 18 lines] > > John > SMTP? But then what is the 'W' in WSDL? Still Web. Well... 'W' cannot be read without 'S'. So, 'WS'-'D'-'L'... A description language describing a WebService. If one looks at the bindings section of WSDL, it would be clear that: 1. WSDL can have a SOAP binding. Other bindings are also possible 2. The WebService location can be an HTTP URL For SMTP, the location may be an email address. > I'm familiar with WSDL enough to have my own opinion but would you say > that WSDL is, in function / purpose, akin to a DTD / schema but > specifically for transport / deserialization? Kind of... yes. Specifying what is the content to be sent and received on the wire and to/from what location.  SignatureHappy Hacking, Gaurav Vaish | http://www.mastergaurav.com http://articles.edujinionline.com/webservices ------------------- >> Most XML web services use SOAP, but this is not required. The WSDL file >> can specify more than one transport, more than one encoding, etc. One >> could use encrypted and compressed binary over SMTP if needed, and you'd >> still specify it with a WSDL document. > > SMTP? But then what is the 'W' in WSDL? W == "Web", so what? Were you serious? > I'm familiar with WSDL enough to have my own opinion but would you say > that WSDL is, in function / purpose, akin to a DTD / schema but > specifically for transport / deserialization? No. It describes one or more web services; it describes the messages they use to communicate, including the schema(s) which describe the messages; it describes the operations of the web service, and groups of those operations; and it describes the bindings between the groups of operations and a particular transport. This is not quite a schema for web services, in my opinion. It's more dynamic than a schema or DTD. John
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