Here you can find the source of getNamespaceURI(final org.w3c.dom.Node n, final String prefix)
public static String getNamespaceURI(final org.w3c.dom.Node n, final String prefix)
//package com.java2s; /*// w w w .j a va2 s . c o m * JBoss, Home of Professional Open Source * Copyright 2005, JBoss Inc., and individual contributors as indicated * by the @authors tag. See the copyright.txt in the distribution for a * full listing of individual contributors. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License as * published by the Free Software Foundation; either version 2.1 of * the License, or (at your option) any later version. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, write to the Free * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA, or see the FSF site: http://www.fsf.org. */ import org.w3c.dom.Node; public class Main { public static String getNamespaceURI(final org.w3c.dom.Node n, final String prefix) { final Node prefixDeclaration = n.getAttributes().getNamedItem("xmlns:" + prefix); if (prefixDeclaration != null) { // we have found the good NameSpace return prefixDeclaration.getNodeValue(); } // we have found the good NameSpace // we look for the NameSpace in the parent Node return getNamespaceURI(n.getParentNode(), prefix); } }