import com.sun.xml.internal.txw2.output.TXWSerializer; //导入依赖的package包/类
/**
 * Creates a new {@link TypedXmlWriter} to write a new instance of a document.
 *
 * @param rootElement
 *      The {@link TypedXmlWriter} interface that declares the content model of the root element.
 *      This interface must have {@link XmlElement} annotation on it to designate the tag name
 *      of the root element.
 * @param out
 *      The target of the writing.
 */
public static <T extends TypedXmlWriter> T create( Class<T> rootElement, XmlSerializer out ) {
    if (out instanceof TXWSerializer) {
        TXWSerializer txws = (TXWSerializer) out;
        return txws.txw._element(rootElement);
    }

    Document doc = new Document(out);
    QName n = getTagName(rootElement);
    return new ContainerElement(doc,null,n.getNamespaceURI(),n.getLocalPart())._cast(rootElement);
}