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RE: XQuery parameters

From: Michael Rys <mrys@microsoft.com>
Date: Thu, 14 Nov 2002 10:40:55 -0800
Message-ID: <5C39F806F9939046B4B1AFE652500A3A037027C8@RED-MSG-10.redmond.corp.microsoft.com>
To: Stéphane Mbaye <stephane.mbaye@gael.fr>, "XQuery" <www-ql@w3.org>
Dear Stephane

 

Thanks for your comment and suggestion. We are currently indeed looking into such mechanisms.

 

Although as a workaround, you could always wrap your XQuery expression into a parameterized function and provide the function parameter as part of your function invocation (this assumes that the XQuery API provides a way to call an XQuery function directly).

 

Best regards

Michael

 

-----Original Message-----
From: Stéphane Mbaye [mailto:stephane.mbaye@gael.fr] 
Sent: Thursday, November 14, 2002 6:55 AM
To: XQuery
Subject: XQuery parameters

 

Dear Sirs,

 

does the XQuery language foresee a mechanism for parameters set outside the query script ?

Such a system would enable the evaluation of queries from different documents or with different

extents, constants, etc. without modifying the source code of the query.

 

The parameter may be atomic values, possibly labeled or identified by a QName and have a default value

such as attributes of XML elements.

 

As an example a parameterized query may be :

 

<authlist>

 {

   let $input := document( parameter("inputDocument",xsd:anyURI,"bibl.xml") <!-THE PARAMETER -->

   for $a in distinct-values($input//author)

   return

     <author>

      {

        <name>

           { $a/text() }

        </name>,

        <books>

         {

           for $b in $input//book

           where $b/author = $a

           return $b/title 

         }

        </books>

      }

     </author>

 }

</authlist>

 

Best regards

 


 

Stéphane

Mbaye


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Received on Thursday, 14 November 2002 13:41:26 UTC

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