[Pywebsvcs-talk] multiple operations

[Dave S. <sem...@nc...>]

Hello,

I am writing a service that has multiple operations defined in the wsdl 
porttype
section. Both operations take an integer as input and produce a string as 
output.
The first operation retrieves the first name associated with the given 
integer id and the
second operation retrieves the last name associated with the id. I am using 
document
style soap with http. I am also using ZSI python to do this stuff. I define 
a single input
type and single output type. The input and output messages of the two 
operations
are based on the two types and in fact share them. The wsdl file I use 
looks like
this:

<?xml version="1.0" encoding="UTF-8"?>
<definitions name="Names"
	targetNamespace="http://www.ncsa.uiuc.edu/Names.wsdl"
	xmlns="http://schemas.xmlsoap.org/wsdl/"
	xmlns:soap="http://schemas.xmlsoap.org/wsdl/soap/"
	xmlns:tns="http://www.ncsa.uiuc.edu/Names.wsdl"
	xmlns:xsd="http://www.w3.org/2001/XMLSchema">

	<types>
         <xsd:schema elementFormDefault="qualified" 
targetNamespace="http://www.ncsa.uiuc.edu/Names.wsdl">
                 <xsd:element name="MyStringType">
                         <xsd:complexType>
                                 <xsd:sequence>
                                         <xsd:element  name="Mystring" 
type="xsd:string"/>
                                 </xsd:sequence>
                         </xsd:complexType>
                 </xsd:element>
                 <xsd:element name="MyIntType">
                         <xsd:complexType>
                                 <xsd:sequence>
                                         <xsd:element name="MyInt" 
type="xsd:int"/>
                                 </xsd:sequence>
                         </xsd:complexType>
                 </xsd:element>
         </xsd:schema>
         </types>


	<message name="FirstRequest">
		<part name="parameter" element="tns:MyIntType"/>
	</message>
	<message name="FirstResponse">
		<part name="parameter" element="tns:MyStringType"/>
	</message>
	<message name="LastRequest">
		<part name="parameter" element="tns:MyIntType"/>
	</message>
	<message name="LastResponse">
		<part name="parameter" element="tns:MyStringType"/>
	</message>

	<portType name="Names_PortType">
		<operation name="GetFirstName">
			<input message="tns:FirstRequest"/>
			<output message="tns:FirstResponse"/>
		</operation>
		<operation name="GetLastName">
			<input message="tns:LastRequest"/>
			<output message="tns:LastResponse"/>
		</operation>
	</portType>
	
	<binding name="Names_Binding" type="Names_PortType">
		<soap:binding style="document"
			transport="http://schemas.xmlsoap.org/soap/http"/>
		<operation name="GetFirstName">
			<soap:operation soapAction=""/>
			<input>
				<soap:body use="literal"/>
			</input>
			<output>
				<soap:body use="literal"/>
			</output>
		</operation>
		<operation name="GetLastName">
			<soap:operation soapAction=""/>
			<input>
				<soap:body use="literal"/>
			</input>
			<output>
				<soap:body use="literal"/>
			</output>
		</operation>
	</binding>

	<service name="NamesService">
		<documentation>WSDL file to describe Names services</documentation>
		<port binding="tns:Names_Binding" name="Names_Port" >
			<soap:address location="http://trecc-dev.ncsa.uiuc.edu:9900/Names"/>
		</port>
	</service>
</definitions>

I use wsdl2py and wsdl2dispatch to generate the appropriate python files. 
The problem is that the server only seems
to know about one of the operations. It seems that the input type, 
MyIntType in this case, and the target name space
are used to determine which method the server invokes. Since those items 
are the same for both operations only one
is seen.

And now to my question: Is this the way the wsdl is supposed to work? I can 
fix the problem above by creating
another type for one of the method inputs and calling it something else. 
But then there would be two identical types
that differ by name only. That doesnt seem logical. It seems odd that the 
operation names that appear in the porttype
tag are not used to specify the methods. What is the logic behind that? 
Finally, is there
a good reference for writing wsdl documents? I have been to the w3c site 
and read the docs there. The other material
on the web just gives examples for one method ( hello world :)). I am 
looking for something with more elaborate
examples. I am very interested in understanding this.

Thanks
Dave Semeraro