import com.sun.org.apache.xerces.internal.dom.EntityImpl; //导入依赖的package包/类
public void doctypeDecl(DocumentType node) throws XNIException {
    /** Create new DocumentType node for the target. */
    if (fDocumentImpl != null) {
        DocumentType docType = fDocumentImpl.createDocumentType(node.getName(), node.getPublicId(), node.getSystemId());
        final String internalSubset = node.getInternalSubset();
        /** Copy internal subset. */
        if (internalSubset != null) {
            ((DocumentTypeImpl) docType).setInternalSubset(internalSubset);
        }
        /** Copy entities. */
        NamedNodeMap oldMap = node.getEntities();
        NamedNodeMap newMap = docType.getEntities();
        int length = oldMap.getLength();
        for (int i = 0; i < length; ++i) {
            Entity oldEntity = (Entity) oldMap.item(i);
            EntityImpl newEntity = (EntityImpl) fDocumentImpl.createEntity(oldEntity.getNodeName());
            newEntity.setPublicId(oldEntity.getPublicId());
            newEntity.setSystemId(oldEntity.getSystemId());
            newEntity.setNotationName(oldEntity.getNotationName());
            newMap.setNamedItem(newEntity);
        }
        /** Copy notations. */
        oldMap = node.getNotations();
        newMap = docType.getNotations();
        length = oldMap.getLength();
        for (int i = 0; i < length; ++i) {
            Notation oldNotation = (Notation) oldMap.item(i);
            NotationImpl newNotation = (NotationImpl) fDocumentImpl.createNotation(oldNotation.getNodeName());
            newNotation.setPublicId(oldNotation.getPublicId());
            newNotation.setSystemId(oldNotation.getSystemId());
            newMap.setNamedItem(newNotation);
        }
        append(docType);
    }
}