"soap:binding" - Binding Message Style and Transportation

WSDL Tutorials - Herong's Tutorial Examples

∟WSDL 1.1 Binding Extension for SOAP 1.1

∟"soap:binding" - Binding Message Style and Transportation

This section describes 'soap:binding', a SOAP extension element that specifies the binding message protocol and the transportation protocol, SOAP 1.1 over HTTP, for example.

"soap:binding" is a SOAP extension element used as a sub element of the "wsdl:binding" top element. "soap:binding" is used to specify that this binding is bound to the SOAP 1.1 message protocol and a given transportation protocol. The syntax of "soap:binding" looks like this:

<wsdl:definitions ...>
  <wsdl:binding ...>
    <soap:binding transport="uri" style="rpc|document"/>
  </wsdl:binding>
</wsdl:definitions>

Notes on the "soap:binding" element:

transport="uri" - Provides a namespace representing a SOAP transportation protocol. For example, transport="http://schemas.xmlsoap.org/soap/http" represents SOAP over HTTP. This is a required attribute.
style="rpc|document" - Provides a default message style for each contained operation. This is an optional attribute. The default is style="document".

Here is an example of "soap:binding" element:

  <wsdl:binding name="helloBinding" type="hy:helloPortType">
    <soap:binding style="document"
      transport="http://schemas.xmlsoap.org/soap/http"/>
    <wsdl:operation name="Hello">
      ...
    </wsdl:operation>
  </wsdl:binding>

In this example,

style="document" indicates that "document" message style should be used as the default style for all operations.
transport="http://schemas.xmlsoap.org/soap/http" indicates that SOAP over HTTP should be used for all operations.