# Multiple output parameters in SOAP

**URL:** <https://www.ruby-forum.com/t/multiple-output-parameters-in-soap/100019>\
**Category:** Ruby\
**Created:** [July 26, 2006, 6:52pm UTC](https://www.ruby-forum.com/t/multiple-output-parameters-in-soap/100019 "2006-07-26T18:52:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Jacob\_Maine](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/df705f/32.png) [@Jacob\_Maine](https://www.ruby-forum.com/u/Jacob_Maine)\
**Post date:** [July 26, 2006, 6:52pm UTC](https://www.ruby-forum.com/t/multiple-output-parameters-in-soap/100019/1 "2006-07-26T18:52:50Z")

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Hi all,

Apologies for the cross-posting to the Rails mailing list - I looked  
deeper  
into Action Web Service and realized it probably isn’t going to do what  
I  
want.

I’m trying to use soap4r to write a web service server that will return  
multiple output parameters - something like the following:

\<?xml version="1.0" encoding="UTF-8" ?\> 0 Success 

This form is mentioned briefly in the W3C SOAP spec  
[SOAP Version 1.2 Part 0: Primer (Second Edition)](http://www.w3.org/TR/soap12-part0/#L1185) and again at  
[http://www.w3.org/TR/soap12-part0/#Example5](http://www.w3.org/TR/soap12-part0/#Example5). I wish I could use a  
struct or  
array to wrap these responses, but I’m re-writing an existing web  
service,  
and the existing clients won’t be able to interpret this:

\<?xml version="1.0" encoding="UTF-8" ?\> Success 0 

The extra tag, representing an instance of a ReturnStatus  
struct,  
is getting in the way. The problem seems to be that since Ruby  
functions  
always return one value (possibly an object with attributes) the soap4r  
implementation always sets that object as the only child of the web  
service  
response tag. Is there a way to define a mapping that will leave an  
element  
out, but encode its children? Or some other way to return multiple  
un-wrapped values?

Thanks in advance for your help.

Jacob Maine

---

<div class="post-metadata">

**Author:** ![Jacob\_Maine](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/j/df705f/32.png) [@Jacob\_Maine](https://www.ruby-forum.com/u/Jacob_Maine)\
**Post date:** [August 7, 2006, 6:38am UTC](https://www.ruby-forum.com/t/multiple-output-parameters-in-soap/100019/2 "2006-08-07T06:38:55Z")

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Hi,

Sorry for late reply. I don’t know AWS so you may need to investigate  
AWS thing more…

Jacob Maine wrote:

> 

It can be a document/literal service. You really want to do rpc/encoded  
service + output parameter?

> The extra tag, representing an instance of a ReturnStatus struct,  
> is getting in the way. The problem seems to be that since Ruby functions  
> always return one value (possibly an object with attributes) the soap4r  
> implementation always sets that object as the only child of the web service  
> response tag. Is there a way to define a mapping that will leave an element  
> out, but encode its children? Or some other way to return multiple  
> un-wrapped values?

Here is the WSDL I know that uses rpc/encoded + output parameter.  
[http://api.map-and-go.com/3.3/server?wsdl](http://api.map-and-go.com/3.3/server?wsdl)  
(It’s not mine and it’s just an example WSDL for this case I know.  
Please do not contact to the owner about this.)

Run wsdl2ruby.rb against the WSDL and see mms\_MizGIS.rb how you can  
define a service with output parameter.

Regards,  
// NaHi  
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