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# XML DOM lookupNamespaceURI() Method * * Element Object](#) * * * ## Definition and Usage The lookupNamespaceURI() method returns the namespace URI matching a specified prefix on the current node. ## Syntax elementNode.lookupNamespaceURI(prefix) | Parameter | Description | | :--- | :--- | | prefix | Required. A string specifying the prefix to look up. | * * * ## Example The following code snippet uses [loadXMLDoc()](#) to load "[books_ns.xml](#)" into xmlDoc, and looks up the namespace URI for the prefix "c" in the first element: ## Example xmlDoc=loadXMLDoc("books_ns.xml"); x=xmlDoc.getElementsByTagName("book"); document.write(x.lookupNamespaceURI("c")); Output: [Try it »](#) * * Element Object](#)