return metaCharsetPattern;
    }

    /*
     * (non-Javadoc)
     *
     * @see org.codelibs.fess.crawler.extractor.impl.AbstractXmlExtractor#getTagPattern()
     */
    @Override
    protected Pattern getTagPattern() {
        // not used
        return null;
    }

    /**
     * Adds a feature to the extractor.
     *
     * @param key   the key of the feature