Index: trunk/src/org/openstreetmap/josm/io/OsmIdReader.java
===================================================================
--- trunk/src/org/openstreetmap/josm/io/OsmIdReader.java	(revision 420)
+++ trunk/src/org/openstreetmap/josm/io/OsmIdReader.java	(revision 421)
@@ -31,5 +31,5 @@
 
 	@Override public void startElement(String namespaceURI, String localName, String qName, Attributes atts) throws SAXException {
-		if (qName.equals("node") || qName.equals("way")) {
+		if (qName.equals("node") || qName.equals("way") || qName.equals("relation")) {
 			try {
 				entries.put(Long.valueOf(atts.getValue("id")), qName);