public function addLink($key, $href, array $meta=[]) {
		$this->ensureLinksObject();
		$this->links->add($key, $href, $meta);
	}
public function addLink($key, $href, array $meta=[]) {
		$this->ensureLinksObject();
		$this->links->add($key, $href, $meta);
	}
public function addLink ( $ key , $ href , array $ meta = [ ] ) { $ this -> ensureLinksObject ( ) ; $ this -> links -> add ( $ key , $ href , $ meta ) ; }
set a key containing a link

@param string $key
@param string $href
@param array  $meta optional, if given a LinkObject is added, otherwise a link string is added
set a key containing a link