WSDL rules and examples (1)

First, let's look at a simple Java code. We use it as the WSDL service implementation code:
Public class test
{
Public String echo (string U ){
Return "hello" + U;
}
}
Then let's look at the WSDL exported using it:
<? XML version = "1.0" encoding = "UTF-8"?>
<WSDL: Definitions targetnamespace = "http://businessEngine.hongsoft.com" xmlns = "http://schemas.xmlsoap.org/wsdl/" xmlns: apachesoap = "http://xml.apache.org/xml-soap" xmlns: impl = "http://businessEngine.hongsoft.com-impl" xmlns: INTF = "http://businessEngine.hongsoft.com" xmlns: soapenc = "http://schemas.xmlsoap.org/soap/encoding/" xmlns: WSDL = "http://schemas.xmlsoap.org/wsdl/" xmlns: wsdlsoap = "http://schemas.xmlsoap.org/wsdl/soap/" xmlns: XSD = "http://www.w3.org/2001/XMLSchema">
<WSDL: types/> // we do not have a custom type

<WSDL: Message name = "echoresponse"> // The returned message.

<WSDL: part name = "echoreturn" type = "XSD: string"/>

</WSDL: Message>

<WSDL: Message name = "echorequest"> // Request Message

<WSDL: part name = "U" type = "XSD: string"/>

</WSDL: Message>

<WSDL: porttype name = "test"> // A porttype can look at a class

<WSDL: Operation name = "Echo" parameterorder = "U"> // an operation is a method.

<WSDL: input message = "INTF: echorequest" name = "echorequest"/>

<WSDL: Output Message = "INTF: echoresponse" name = "echoresponse"/>

</WSDL: Operation>

</WSDL: porttype>

<WSDL: Binding name = "testsoapbinding" type = "INTF: Test">
// Specify the message encapsulation method below

<Wsdlsoap: Binding style = "RPC" Transport = "http://schemas.xmlsoap.org/soap/http"/>
// The WSDL description is bound to the specific implementation. The soap method is used here.

<WSDL: Operation name = "Echo">

<Wsdlsoap: Operation soapaction = ""/>

<WSDL: input name = "echorequest">

<Wsdlsoap: Body encodingstyle = "http://schemas.xmlsoap.org/soap/encoding/" namespace = "http://businessEngine.hongsoft.com" use = "encoded"/>

</WSDL: input>

<WSDL: Output name = "echoresponse">

<Wsdlsoap: Body encodingstyle = "http://schemas.xmlsoap.org/soap/encoding/" namespace = "http://businessEngine.hongsoft.com" use = "encoded"/>

</WSDL: output>

</WSDL: Operation>

</WSDL: Binding>
// Associate the published service with the soap binding

<WSDL: Service name = "testservice">

<WSDL: Port binding = "INTF: testsoapbinding" name = "test">

<Wsdlsoap: address location = "http: // localhost: 8080/hongsoft/services/test"/>

</WSDL: Port>

</WSDL: Service>

</WSDL: Definitions>