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## XML DOM Element namespaceURI Property The `namespaceURI` property returns the namespace Uniform Resource Identifier (URI) of the selected element. In XML documents, namespaces are used to avoid naming conflicts when different XML documents share the same element names. The `namespaceURI` property allows you to programmatically retrieve this identifier. --- ## Definition and Usage * The `namespaceURI` property returns a string representing the namespace URI of the element. * If the element does not have a namespace, or if the node is not an element or attribute, this property returns `null` (or `undefined` in some environments). * This property is **read-only**. --- ## Syntax ```javascript elementNode.namespaceURI ``` ### Return Value * **String**: The namespace URI of the node. * **Null**: If no namespace is specified for the node. --- ## Code Example The following example demonstrates how to retrieve the namespace URI of an element. Suppose we have an XML file named `books_ns.xml` with the following content: ```xml The Hobbit ``` We can load this XML document and retrieve the namespace URI of the `` element using the following JavaScript code: ```javascript // Load the XML document var xmlDoc = loadXMLDoc("books_ns.xml"); // Get the first