WSDL - understanding message definitions - wsdl

Question

I am trying to understand the structure of wsdl definitions, looking at the example found here.
I get the service, portType and operation parts, it's at the messages where I have a problem "reading" the specification.
So, just focusing at a single message (multiply), and ignoring the rest, I see a structure like:
<wsdl:definitions..>
<wsdl:types>
<xsd:schema>
<xsd:element name="multiply" type="tns:multiply"/>
<xsd:complexType name="multiply">
...
</xsd:complexType>
</xsd:schema>
</wsdl:types>
...
<wsdl:message name="multiply">
<wsdl:part element="tns:multiply" name="parameters"/>
</wsdl:message>
...
<wsdl:portType>
...
</wsdl:portType>
<wsdl:service>
...
</wsdl:service>
</wsdl:definitions>
Can anyone provide a sentence explaining what multiply is, beginning with: "multiply is a message that's ..." ??
Moreover, could somebody explain how many uses of the name "multiply" we have? I think there are multiple and we seem to avoid clashes through the use of XML namespaces and perhaps different "namespaces" for XML elements and types.

Answer 1

multiply is a message containing a single part, named parameters, consisting of the single element, tns:multiply. That element is of type tns:multiply.
I used XMLspy to fill this example out a bit:
<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
xmlns:http="http://schemas.xmlsoap.org/wsdl/http/" xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:soapenc="http://schemas.xmlsoap.org/soap/encoding/"
xmlns:mime="http://schemas.xmlsoap.org/wsdl/mime/"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:tns="http://new.webservice.namespace" targetNamespace="http://new.webservice.namespace">
<wsdl:types>
<xs:schema targetNamespace="http://new.webservice.namespace" elementFormDefault="qualified">
<xs:complexType name="multiply">
<xs:sequence>
<xs:element name="x" type="xs:int"/>
<xs:element name="y" type="xs:int"/>
</xs:sequence>
</xs:complexType>
<xs:element name="multiply" type="tns:multiply"/>
</xs:schema>
</wsdl:types>
<wsdl:message name="multiply">
<wsdl:part name="parameters" element="tns:multiply"/>
</wsdl:message>
<wsdl:portType name="NewPortType">
<wsdl:operation name="NewOperation">
<wsdl:input message="tns:multiply"/>
</wsdl:operation>
</wsdl:portType>
<wsdl:binding name="NewBinding" type="tns:NewPortType">
<soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<wsdl:operation name="NewOperation">
<soap:operation soapAction="urn:#NewOperation"/>
<wsdl:input>
<soap:body use="literal"/>
</wsdl:input>
</wsdl:operation>
</wsdl:binding>
<wsdl:service name="NewService">
<wsdl:port name="NewPort" binding="tns:NewBinding">
<soap:address location="No target address"/>
</wsdl:port>
</wsdl:service>
</wsdl:definitions>
This leads to the following SOAP request:
<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP-ENV:Body>
<m:multiply xmlns:m="http://new.webservice.namespace">
<m:x>0</m:x>
<m:y>0</m:y>
</m:multiply>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>