private function getDefaultConfiguration(\DOMXPath $xpath)
{
$charFilters = $this->parseFilters($xpath, self::CHAR_FILTER_TYPE_ROOT_NODE, self::CHAR_FILTER_TYPE_NODE);
$filters = $this->parseFilters($xpath, self::FILTER_TYPE_ROOT_NODE, self::FILTER_TYPE_NODE);
$analyzers = $this->parseAnalyzers($xpath, array_keys($charFilters), array_keys($filters));
$defaultConfiguration = [self::CHAR_FILTER_TYPE_NODE => $charFilters, self::FILTER_TYPE_NODE => $filters, self::ANALYZER_TYPE_NODE => $analyzers];
return $defaultConfiguration;
}