private function processNestedAttributes($property, $content)
    {
        $results = array();

        if ($this->isAssociativeArray($content)) {
            foreach ($content as $key => $value) {
                $results = array_merge($results, $this->processNestedAttributes("{$property}:{$key}", $value));
            }
        }
        else {
            foreach((array)$content as $con) {
                if ($this->isAssociativeArray($con))
                    $results = array_merge($results, $this->processNestedAttributes($property, $con));
                else
                     $results[] =  $this->metaTag($property, $con);
            }
        }

        return $results;
    }