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# XML DOM namespaceURI Property * * Attr Object](#) * * * ## Definition and Usage The namespaceURI property sets or returns the namespace URI of an attribute. ## Syntax attrObject.namespaceURI * * * ## Example The following code snippet uses [loadXMLDoc()](#) to load "[books_ns.xml](#)" into xmlDoc and returns the namespace URI of the "lang" attribute: ## Example xmlDoc=loadXMLDoc("books_ns.xml"); x=xmlDoc.getElementsByTagName('book'); ​ for(i=0;i<x.length;i++){document.write("Prefix: " + x.item(i).attributes.prefix); document.write("
"); document.write("Local name: " + x.item(i).attributes.localName); document.write("
"); document.write("Namespace URI: " + x.item(i).attributes.namespaceURI); document.write("
"); document.write("Base URI: " + x.item(i).attributes.baseURI); document.write("
"); document.write("
"); } [Try it »](#) * * Attr Object](#)