Testing the "opt:root" instruction.

>>>>templates/test.tpl
<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
<opt:root>
<p>foo</p>
<p>foo</p>
</opt:root>

>>>>data.php
$this->tpl->singleRootNode = true;

>>>>expected.txt
OUTPUT

>>>>result.txt
<p>foo</p>
<p>foo</p>