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By :Mark Wilson
I am the creator of TopXML. I am available for international and local (Australia) contracts. I am a Solution Architect/Business Analyst. I have worked in IT in several countries (NZ, Australia, South Africa, UK) building and training teams for government and very large non-governmental organizations. I am ex-Microsoft Consulting Services. I wrote the first book on Microsoft XML published in 2000 called XML Programming with VB and ASP. Most recently I have been building tools for the SEO industry. Ask me for a 37 point SEO health-checkup for your website.
First posted :03/24/2008
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XQuery Constructors

Constructors are a very powerful feature of XQuery. They allow you to add XML to your xquery for inclusion in the output tree. A special and much used type is the Enclosed Expression, used to enclose an expression to form a separate block. It also has constructors for creating CDATA sections and XML Processing Instructions.

Worksheet 6: Constructor examples

Expression:

Example(s):

Constructors

1. <root>

     <tutorial>

       <title>XQuery Explained</title>

     </tutorial>

   </root>

This produces the following output, which is fully self-explanatory – it simply copies the XML:

<?xml version="1.0"?>

<root>

  <tutorial>

    <title>XQuery Explained</title>

  </tutorial>

</root>

2. <root>

   <childnode></childnode>

   { IF document("xqt")//title[1] < "xxx" THEN

     <yes/> ELSE <no/> }

   </root>

This xquery produces the following output:

<?xml version="1.0"?>

<root>

  <childnode/>

  <yes/>

</root>


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