private function iterate(array $content, $parent = null)
    {
        foreach ($content as $element) {
            $this->process($element, $parent);
        }
    }
private function iterate(array $content, $parent = null)
    {
        foreach ($content as $element) {
            $this->process($element, $parent);
        }
    }
private function iterate ( array $ content , $ parent = null ) { foreach ( $ content as $ element ) { $ this -> process ( $ element , $ parent ) ; } }
Iterate given content array and call `process` for every element inside

@param array $content
@param null|BaseElement $parent
Iterate given content array and call process for every element inside