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The .NET Framework includes support only for the most common use of SOAP, which is SOAP over HTTP. If you want more flexibility, you might want to consider the WSE (Web Services Enhancements) toolkit available from Microsoft, which is introduced in the next chapter.

SOAP is a fairly straightforward standard. The first principle is that every SOAP message is an XML document. This XML document has a single root element that is the SOAP envelope. The rest of the data for the message is stored inside the envelope, which includes a header section and a body.

SOAP was originally considered an acronym (Simple Object Access Protocol). However, in the current versions of the SOAP standard, this is no longer the case. For the detailed SOAP specifications, surf to http://www.w3.org/TR/soap.

More often, you ll need to check for the influence of a particular type, whether a class descends from it or whether an object is an instance of it. This is a much more robust solution than using , as it takes class inheritance into account when determining success or failure. Python provides two built-in functions for this purpose. from Returns somewhere in its ancestry if and are the same, or if inherits

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Essentially, .NET web services use two types of SOAP messages. The client sends a request message to a web service to trigger a web method. When processing is complete, the web service sends back a response message. Both of these messages have the same format, which is shown in Figure 33-2.

Two different (but closely related) styles of SOAP exist. Document-style SOAP views the data exchanged as documents. In other words, each SOAP message you send or receive contains an XML document in its body. RPC-style SOAP views the data exchange as method calls on remote objects. The remote object may be a Java object, a COM component, a .NET object, or something else entirely. In RPC-style SOAP, the outermost element in the request is always named after the method, and there is an element for each parameter on that method. In the response, the outermost element has the same name as the method with the text Response appended. Seeing as .NET web services embrace the object-oriented RPC model, you might assume that .NET web services use RPC-style SOAP. However, this isn t the case. The simple reason is that document-style SOAP is more flexible it gives you the ability to exchange arbitrary XML documents between the web service and the web service consumer. However, even though .NET uses document-style SOAP, it formats messages in a similar way to RPC-style SOAP, using many of the same conventions. To make life even more interesting, data in a SOAP message can be encoded in two ways literal and SOAP section 5. Literal encoding means that the data is encoded according to a specific XML schema. SOAP section 5 encoding means the data is encoded according to the similar, but more restricted, rules set out in section 5 of the SOAP specification. The section 5 rules are a bit of a throwback. The underlying reason they exist is because SOAP was developed before the XML Schema standard was finalized.

By default, all .NET web services use document-style SOAP with literal encoding. You should consider changing this behavior only if you need to be compatible with a legacy application.

At this point, you might wonder why you need to know any of these lower-level SOAP details. In most cases, you don t. However, sometimes you might want to change the overall encoding of your web service. One reason might be that you need to expose a web method that needs to be called by a client that supports only RPC-style SOAP. Although this scenario is becoming less and less common (and it violates WS-Interoperabiltiy), it can still occur. ASP .NET has two attributes (both of which are found in the System.Web.Services.Protocols namespace) that you can use to control the overall encoding of all methods in a web service:

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