* a Map, or an instance of a specified class.
 * </p>
 *
 * <p>
 * Example usage:
 * </p>
 *
 * <pre>
 * XpathTransformer transformer = new XpathTransformer();
 * transformer.addFieldRule("title", "//title/text()");
 * transformer.addFieldRule("body", "//body/p/text()");
 *
 * ResponseData responseData = new ResponseData();

 * </p>
 *
 * <pre>
 * XmlTransformer transformer = new XmlTransformer();
 * transformer.setNamespaceAware(true);
 * transformer.setCacheDuration(30);
 * transformer.addFieldRule("title", "/book/title/text()");
 * transformer.addFieldRule("author", "/book/author/name/text()");
 *
 * ResponseData responseData = new ResponseData();

     * @param xpath the XPath expression for extraction
     * @param isPruned whether the extracted content should be pruned
     */
    public void addFieldRule(final String name, final String xpath, final boolean isPruned) {
        addFieldRule(name, xpath);
        fieldPrunedRuleMap.put(name, isPruned);
    }

    /**
     * Sets the URL conversion map for transforming URLs.
     *