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XQuery and integration with Web Service method that returns XML

Posted on 2011-03-15
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I am trying to understand how I might be able to call a Web Service method from XQuery and then interpret the results that the service sends back - unfortunately I have little experience in XQuery and even less in Web Services.

Can anyone give me an example of some XQuery code that would
 - call a Web Service method with a couple of parameters
 - the Web Service method would return a chunk of XML
 - the XQuery would then interpret that returned XML and carry out some action on what it finds
 
 
It's the XQuery end of things that I am interested in rather than the Web Service end.


Thanks.
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Question by:Letterpart
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Expert Comment

by:Geert Bormans
ID: 35136482
it all depends on what the type of Web Service you have to deal with
and of the XQuery implementation that is used

XQuery is commonly used with rest interfaces to XML databases
Then the XQuery can be as simple as the below example
(real url obfuscated for this forum)
let $a := doc('http://.../datum/1807-08-12')
return
 <title>
    {$a//title[1]/text()}
 </title>

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Expert Comment

by:Geert Bormans
ID: 35136484
rest being REST of course
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Geert Bormans earned 500 total points
ID: 35136496
Here is an example on how DataDirect XQuery interface deals with SOAP calls
(which most generally are extensions to the XQuery language)
http://www.xquery.com/architecture/SOAP.html
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Author Comment

by:Letterpart
ID: 35136693
I have seen how I can make requests to the Web Service methods I will need to access using a free Microsoft product - Web Service Studio  (http://archive.msdn.microsoft.com/webservicestudio20 ).

That allowed me to retrieve the WDSL and see the various methods and parameters.

When I use that product to invoke a method I can see that it appears to be using SOAP and there is Request information in XML format, and Response information in XML format.
It looks like your DataDirect example of building a message payload and invoking a SOAP Request will be useful - thanks for that, and your other example.
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Author Closing Comment

by:Letterpart
ID: 35140268
Many thanks for your example code and reference link, and prompt response.
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Expert Comment

by:Geert Bormans
ID: 35142355
welcome
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