*  <br>
     * comment: Mapping for document metadata names.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getCrawlerMetadataNameMapping();

    /**
     * Get the value for the key 'crawler.document.html.content.xpath'. <br>
     * The value is, e.g. //BODY <br>
     * comment: XPath to extract main content from HTML documents.