diff -r b50e77d23d13 -r fd83cd102325 java/alt2xml-out-xpath/src/cz/frantovo/alt2xml/out/xpath/DocumentNamespaceContext.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/java/alt2xml-out-xpath/src/cz/frantovo/alt2xml/out/xpath/DocumentNamespaceContext.java	Wed Sep 17 21:31:18 2014 +0200
@@ -0,0 +1,59 @@
+/**
+ * Alt2XML
+ * Copyright © 2014 František Kučera (frantovo.cz)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+package cz.frantovo.alt2xml.out.xpath;
+
+import java.util.Iterator;
+import javax.xml.XMLConstants;
+import javax.xml.namespace.NamespaceContext;
+import org.w3c.dom.Document;
+import org.w3c.dom.Node;
+
+/**
+ *
+ * @author Ing. František Kučera (frantovo.cz)
+ */
+public class DocumentNamespaceContext implements NamespaceContext {
+
+	private final Node document;
+
+	public DocumentNamespaceContext(Node document) {
+		this.document = document;
+	}
+
+	@Override
+	public String getNamespaceURI(String prefix) {
+		if (prefix.equals(XMLConstants.DEFAULT_NS_PREFIX)) {
+			return document.lookupNamespaceURI(null);
+		} else {
+			return document.lookupNamespaceURI(prefix);
+		}
+	}
+
+	@Override
+	public String getPrefix(String xmlns) {
+		return document.lookupPrefix(xmlns);
+	}
+
+	/**
+	 * TODO: support multiple prefixes
+	 */
+	@Override
+	public Iterator getPrefixes(String xmlns) {
+		return new OneItemIterator(getPrefix(xmlns));
+	}
+}