<?php
$xml = <<<XML
<ProjectTechnologies>
<ProjectTechnology>
<Technology>
<Name>SQL</Name>
</Technology>
<Subtechnologies/>
</ProjectTechnology>
<ProjectTechnology>
<Technology>
<Name>SQL</Name>
</Technology>
<Subtechnologies>
<Subtechnology>
<Name>Mysql</Name>
</Subtechnology>
</Subtechnologies>
</ProjectTechnology>
</ProjectTechnologies>
XML;
$dom = new DOMDocument();
$dom->loadXML($xml);
$xpath = new DOMXPath($dom);
foreach($xpath->query('/ProjectTechnologies/ProjectTechnology') as $node) {
var_dump(trim($node->textContent));
}