private function normalizePrefix( $localPrefix )
	{
		if ( $localPrefix == 'xml' )
			return $localPrefix;
		$namespace = $this->getInstanceNamespaces()[ $localPrefix ];
		$taxonomy = $this->getInstanceTaxonomy()->getTaxonomyForNamespace( $namespace );
		return $taxonomy
			? $taxonomy->getPrefix()
			: $localPrefix;
	}