DiDom\Element::xml PHP Method

    public function xml($options = 0)
    {
        return $this->toDocument()->xml($options);
    }

 public function testXml()
 {
     $element = new Element('span', 'hello');
     $prolog = '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
     $this->assertEquals($prolog . '<span>hello</span>', $element->xml());
 }