*
 * @see javax.xml.xpath.XPath
 * @see javax.xml.xpath.XPathFactory
 * @see javax.xml.xpath.XPathExpressionException
 */
public class XPathAPI {

    private final XPath xPath;

    /**
     * Creates a new XPathAPI instance.
     */
    public XPathAPI() {
        xPath = createXPath(f -> {});
    }

    /**

        final String xpath = xpathConfigMap.get(XPath.DEFAULT_LANG);
        if (StringUtil.isNotBlank(xpath)) {
            return xpath;
        }
        return fessConfig.getCrawlerDocumentHtmlLangXpath();
    }

    /**
     * Gets the XPath expression for extracting content.
     *
     * @param fessConfig the Fess configuration
     * @param xpathConfigMap the XPath configuration map

        // Test with xpath parameters
        configParameters = "field.xpath.title=//title\nfield.xpath.content=//body";
        result = ParameterUtil.createConfigParameterMap(configParameters);
        assertEquals(2, result.get(ConfigName.XPATH).size());
        assertEquals("//title", result.get(ConfigName.XPATH).get("title"));
        assertEquals("//body", result.get(ConfigName.XPATH).get("content"));

    }

    /**
     * Checks if a path is valid for crawling (not a JavaScript, mailto, or other invalid URL).
     *
     * @param path the path to validate
     * @return true if the path is valid, false otherwise
     */
    protected boolean isValidPath(final String path) {
        if (StringUtil.isBlank(path)) {
            return false;
        }

    }

    /**
     * Adds a metadata field with its corresponding XPath expression for extraction.
     *
     * @param name the name of the metadata field
     * @param xpath the XPath expression to extract the metadata value
     */
    public void addMetadata(final String name, final String xpath) {
        metadataXpathMap.put(name, xpath);
    }

    /*
     * (non-Javadoc)
     *
     * @see

    }

    /**
     * Adds a field rule to the transformer.
     * @param name The name of the field.
     * @param xpath The XPath expression for the field.
     */
    public void addFieldRule(final String name, final String xpath) {
        fieldRuleMap.put(name, xpath);
    }

    /**
     * Returns data as XML content of String.
     *
     * @return XML content of String.
     */

        }
    }

    /**
     * Retrieves a list of XPath nodes from the document.
     *
     * @param doc The XML document.
     * @param xpath The XPath expression.
     * @return A list of XPath nodes.
     * @throws XPathExpressionException if an XPath expression error occurs.
     */
    protected XPathNodes getNodeList(final Document doc, final String xpath) throws XPathExpressionException {

    }

    /**
     * Gets the XPath expression for selecting target nodes.
     *
     * @return the target node path
     */
    public String getTargetNodePath() {
        return targetNodePath;
    }

    /**
     * Sets the XPath expression for selecting target nodes.
     *
     * @param targetNodePath the target node path to set
     */

        }

        // xpath.*
        public static class XPath {
            public static final String DEFAULT_LANG = "default.lang";
            public static final String DEFAULT_CONTENT = "default.content";
            public static final String DEFAULT_DIGEST = "default.digest";
            // xapth.<field>=<value>
        }

        // config.*

/**
 * Utility class for parameter operations.
 */
public class ParameterUtil {
    private static final String CIPHER_PREFIX = "{cipher}";

    /** The XPath field prefix. */
    protected static final String XPATH_PREFIX = "field.xpath.";

    /** The meta field prefix. */
    protected static final String META_PREFIX = "field.meta.";

    /** The value field prefix. */