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## XML DOM: cloneNode() Method The `cloneNode()` method is a built-in function of the XML DOM `Node` object. It is used to create an exact duplicate of a specified node. This method is highly useful when you need to replicate existing elements, attributes, or structures within an XML document without manually recreating each node and its children. --- ## Definition and Usage The `cloneNode()` method duplicates a node and returns the newly created clone. * The cloned node has no parent node (`parentNode` is `null`) until it is explicitly appended or inserted into the document tree using methods like `appendChild()` or `insertBefore()`. * Depending on the parameter passed, the clone can either be a **shallow clone** (copying only the node itself and its attributes) or a **deep clone** (copying the node, its attributes, and all of its descendant child nodes). --- ## Syntax ```javascript var clonedNode = nodeObject.cloneNode(deep); ``` ### Parameters | Parameter | Type | Required | Description | | :--- | :--- | :--- | :--- | | `deep` (or `include_all`) | Boolean | Yes (in XML DOM) | Specifies whether to perform a deep clone.
• `true`: Clones the specified node **and** all of its descendant child nodes (deep clone).
• `false`: Clones **only** the specified node and its attributes, ignoring any child nodes or nested text (shallow clone). | ### Return Value * **Type:** `Node` object. * **Description:** The newly created duplicate node. --- ## Code Example The following example demonstrates how to load an XML file (`books.xml`), clone its first `` node (including all of its child nodes), and append the cloned node to the end of the document. ### Input XML File (`books.xml`) ```xml Giada De Laurentiis 2005 30.00 J K. Rowling 2005 29.99 ``` ### JavaScript Implementation ```javascript // Load the XML document var xmlDoc = loadXMLDoc("books.xml"); // Select the first node var originalBook = xmlDoc.getElementsByTagName('book'); // Clone the node and all of its children (deep clone) var clonedBook = originalBook.cloneNode(true); // Append the cloned node to the root element of the XML document xmlDoc.documentElement.appendChild(clonedBook); // Output the text values of all