public function getIdentifier()
{
// check if we've a parent directory
if ($parent = $this->getParent()) {
return $parent->getIdentifier() . $this->getName() . '/';
}
// load the scheme to prerpare the identifier with
if ($scheme = $this->getScheme()) {
return $scheme . ':' . $this->getName();
}
// the root node needs a scheme
throw new NamingException(sprintf('Missing scheme for naming directory', $this->getName()));
}