Index: src/org/openstreetmap/josm/data/osm/visitor/OsmXmlVisitor.java
===================================================================
--- src/org/openstreetmap/josm/data/osm/visitor/OsmXmlVisitor.java	(revision 34)
+++ src/org/openstreetmap/josm/data/osm/visitor/OsmXmlVisitor.java	(revision 34)
@@ -0,0 +1,93 @@
+package org.openstreetmap.josm.data.osm.visitor;
+
+import java.util.Map.Entry;
+
+import org.jdom.Element;
+import org.openstreetmap.josm.data.osm.Key;
+import org.openstreetmap.josm.data.osm.LineSegment;
+import org.openstreetmap.josm.data.osm.Node;
+import org.openstreetmap.josm.data.osm.OsmPrimitive;
+import org.openstreetmap.josm.data.osm.Track;
+
+
+/**
+ * An visitor which is capable of convert the visited objects to osm xml syntax
+ * using JDOM.
+ *
+ * @author imi
+ */
+public class OsmXmlVisitor implements Visitor {
+
+	private final boolean reference;
+	
+	public Element element;
+
+	/**
+	 * The counter for ids for new objects. 
+	 */
+	private static int newCounter = -1;
+
+	/**
+	 * Specify, which output do you like to have.
+	 * 
+	 * @param reference <code>true</code> means, the xml output is only a reference
+	 * 		containing the id (for deletion and referencing etc).
+	 */
+	public OsmXmlVisitor(boolean reference) {
+		this.reference = reference;
+	}
+
+	
+	public void visit(Node n) {
+		element = new Element("node");
+		addCommon(n);
+		if (!reference) {
+			element.setAttribute("lat", ""+n.coor.lat);
+			element.setAttribute("lon", ""+n.coor.lon);
+		}
+	}
+
+	public void visit(LineSegment ls) {
+		element = new Element("segment");
+		addCommon(ls);
+		if (!reference) {
+			element.setAttribute("from", ""+ls.start.id);
+			element.setAttribute("to", ""+ls.end.id);
+		}
+	}
+
+	@SuppressWarnings("unchecked")
+	public void visit(Track t) {
+		element = new Element("track");
+		addCommon(t);
+		if (!reference) {
+			for (LineSegment ls : t.segments) {
+				OsmXmlVisitor v = new OsmXmlVisitor(true);
+				v.visit(ls);
+				element.getChildren().add(v.element);
+			}
+		}
+	}
+
+	public void visit(Key k) {
+		//TODO
+		throw new RuntimeException("cannot add keys yet.");
+	}
+
+	/**
+	 * Add the common parts of the object.
+	 */
+	private void addCommon(OsmPrimitive osm) {
+		element.setAttribute("uid", ""+(osm.id == 0 ? newCounter-- : osm.id));
+		if (!reference && osm.keys != null) {
+			StringBuilder tags = new StringBuilder();
+			for (Entry<Key, String> e : osm.keys.entrySet()) {
+				tags.append(e.getKey().name);
+				tags.append("=");
+				tags.append(e.getValue());
+				tags.append(";");
+			}
+			element.setAttribute("tags", tags.toString());
+		}
+	}
+}