/**
* @inheritDoc
*/
public function add($element) : bool
{
if ($this->contains($element)) {
throw new RuntimeException("Given element already exists in collection");
}
return parent::add($element);
}
/**
* @return string
*/
public function __toString() : string
{
return sprintf("{$this->name} %s;", implode(' ', (array) $this->params->getIterator()));
}
/**
* @return string
*/
public function __toString() : string
{
return (string) implode("\n", (array) $this->childNodes->getIterator());
}