public function testRender2()
{
$node = Tree::mult(Tree::add('x', 67), Tree::pow(Tree::mult('x', Tree::mult(4, 'x'), Tree::add(Tree::mult('x', 67), Tree::pow(Tree::mult('x', 24), 2))), 2));
$xml = XMLVisitor::init();
$str = $xml->visit($node);
echo $str;
$xml = new \DOMDocument();
$xml->loadXML($str);
$this->assertTrue($xml->schemaValidate(__DIR__ . '/../../../resources/tree-schema.xsd'));
}
public function visitPowerNode(PowerNode $node)
{
$v = new XMLVisitor($this->depth + 3);
return $this->_renderNode($this->_indent($this->depth + 1) . '<power>' . PHP_EOL . $this->_indent($this->depth + 2) . '<base>' . PHP_EOL . $v->visit($node->getBase()) . PHP_EOL . $this->_indent($this->depth + 2) . '</base>' . PHP_EOL . $this->_indent($this->depth + 2) . '<exponent>' . PHP_EOL . $v->visit($node->getExponent()) . PHP_EOL . $this->_indent($this->depth + 2) . '</exponent>' . PHP_EOL . $this->_indent($this->depth + 1) . '</power>');
}