title: xsl transformation - tree xml to plain field-value xml
body: <p>i want to automaticly process by xslt this xml by example, field and values must be dynamicly parsed, not hardcoded:</p>
  
  <pre><code>&lt;root&gt;
  &lt;field1&gt;value1&lt;/field1&gt;
  &lt;field2&gt;value2&lt;/field2&gt;
  &lt;/root&gt;
  </code></pre>
  
  <p>to this:</p>
  
  <pre><code>&lt;items&gt;
  &lt;field&gt;field1&lt;/field&gt;
  &lt;value&gt;value1&lt;/value&gt;
  &lt;field&gt;field2&lt;/field&gt;
  &lt;value&gt;value2&lt;/value&gt;
  &lt;/items&gt;
  </code></pre>
  
  <p>Please help.</p>