Adds a service alias.
string $alias:
Alias $id:
\DOMElement $parent:
private function addServiceAlias($alias, Alias $id, \DOMElement $parent) {
$service = $this->document
->createElement('service');
$service
->setAttribute('id', $alias);
$service
->setAttribute('alias', $id);
if (!$id
->isPublic()) {
$service
->setAttribute('public', 'false');
}
$parent
->appendChild($service);
}