import com.sun.org.apache.xalan.internal.utils.FactoryImpl; //导入依赖的package包/类
/**
 * Method createDocumentFragment
 *
 *
 * NEEDSDOC (createDocumentFragment) @return
 */
synchronized public DTM createDocumentFragment()
{

  try
  {
    DocumentBuilderFactory dbf = FactoryImpl.getDOMFactory(super.useServicesMechnism());
    dbf.setNamespaceAware(true);

    DocumentBuilder db = dbf.newDocumentBuilder();
    Document doc = db.newDocument();
    Node df = doc.createDocumentFragment();

    return getDTM(new DOMSource(df), true, null, false, false);
  }
  catch (Exception e)
  {
    throw new DTMException(e);
  }
}
 

import com.sun.org.apache.xalan.internal.utils.FactoryImpl; //导入依赖的package包/类
private DocumentBuilder getParser() {
    try {
        // we'd really like to cache those DocumentBuilders, but we can't because:
        // 1. thread safety. parsers are not thread-safe, so at least
        //    we need one instance per a thread.
        // 2. parsers are non-reentrant, so now we are looking at having a
        // pool of parsers.
        // 3. then the class loading issue. The look-up procedure of
        //    DocumentBuilderFactory.newInstance() depends on context class loader
        //    and system properties, which may change during the execution of JVM.
        //
        // so we really have to create a fresh DocumentBuilder every time we need one
        // - KK
        DocumentBuilderFactory dbf = FactoryImpl.getDOMFactory(useServiceMechanism);
        dbf.setNamespaceAware( true );
        dbf.setValidating( false );
        return dbf.newDocumentBuilder();
    } catch (ParserConfigurationException e) {
        // this should never happen with a well-behaving JAXP implementation.
        throw new Error(e);
    }
}
 

import com.sun.org.apache.xalan.internal.utils.FactoryImpl; //导入依赖的package包/类
/**
 * Parse the input source and return a Document.
 * @param source The {@code InputSource} of the document
 * @return a DOM Document
 * @throws XPathExpressionException if there is an error parsing the source.
 */
Document getDocument(InputSource source)
    throws XPathExpressionException {
    requireNonNull(source, "Source");
    try {
        // we'd really like to cache those DocumentBuilders, but we can't because:
        // 1. thread safety. parsers are not thread-safe, so at least
        //    we need one instance per a thread.
        // 2. parsers are non-reentrant, so now we are looking at having a
        // pool of parsers.
        // 3. then the class loading issue. The look-up procedure of
        //    DocumentBuilderFactory.newInstance() depends on context class loader
        //    and system properties, which may change during the execution of JVM.
        //
        // so we really have to create a fresh DocumentBuilder every time we need one
        // - KK
        DocumentBuilderFactory dbf = FactoryImpl.getDOMFactory(useServiceMechanism);
        dbf.setNamespaceAware(true);
        dbf.setValidating(false);
        return dbf.newDocumentBuilder().parse(source);
    } catch (ParserConfigurationException | SAXException | IOException e) {
        throw new XPathExpressionException (e);
    }
}
 

import com.sun.org.apache.xalan.internal.utils.FactoryImpl; //导入依赖的package包/类
public Document newDocument(String uri, String qname)
    throws ParserConfigurationException
{
    if (_domImplementation == null) {
        DocumentBuilderFactory dbf = FactoryImpl.getDOMFactory(_useServicesMechanism);
        _domImplementation = dbf.newDocumentBuilder().getDOMImplementation();
    }
    return _domImplementation.createDocument(uri, qname, null);
}