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If an attribute from Templatotron namespace occurs on an element from this namespace, and its local name is neither t:select not t:value-of then it creates an variable which can be used on descendants of the element. Names of the variables must be unique in the document.

XML source

<aaa title="An example">
     <bbb>A</bbb>
     <ccc>a1</ccc>
     <ccc>a2</ccc>
     <bbb>B</bbb>
     <ccc>b1</ccc>
     <ccc>b2</ccc>
     <bbb>C</bbb>
     <ccc>c1</ccc>
     <ccc>c2</ccc>
</aaa>

Templatotron source

<xhtml xmlns="http://www.w3.org/1999/xhtml" xmlns:t="http://zvon.org/templatotron" >
     <head>
          <t:title t:select="/*/@title"/>
     </head>
     <body>
          <table>
               <tr>
                    <t:th t:select="//bbb"/>
               </tr>
               <t:tr t:select="//bbb" t:xxx="position()">
                    <t:td t:select="//ccc[name(preceding-sibling::*[position()=$xxx])='bbb']"/>
               </t:tr>
          </table>
     </body>
</xhtml>
Output

<xhtml xmlns="http://www.w3.org/1999/xhtml" >
     <head>
          <title>An example</title>
     </head>
     <body>
          <table>
               <tr>
                    <th>A</th>
                    <th>B</th>
                    <th>C</th>
               </tr>
               <tr>
                    <td>a1</td>
                    <td>b1</td>
                    <td>c1</td>
               </tr>
               <tr>
                    <td>a2</td>
                    <td>b2</td>
                    <td>c2</td>
               </tr>
               <tr/>
          </table>
     </body>
</xhtml>