Index: src/org/openstreetmap/josm/gui/DefaultNameFormatter.java
===================================================================
--- src/org/openstreetmap/josm/gui/DefaultNameFormatter.java	(revision 4200)
+++ src/org/openstreetmap/josm/gui/DefaultNameFormatter.java	(working copy)
@@ -11,6 +11,7 @@
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
+import java.util.LinkedList;
 import java.util.List;
 import java.util.Set;
 
@@ -42,6 +43,8 @@
 
     static private DefaultNameFormatter instance;
 
+    private static final LinkedList<NameFormatterHook> formatHooks = new LinkedList<NameFormatterHook>();
+
     /**
      * Replies the unique instance of this formatter
      *
@@ -53,6 +56,30 @@
         }
         return instance;
     }
+    
+    /**
+     * Registers a format hook. Adds the hook at the first position of the format hooks.
+     *
+     * @param hook the format hook. Ignored if null.
+     */
+    public static void registerFormatHook(NameFormatterHook hook) {
+        if (hook == null) return;
+        if (!formatHooks.contains(hook)) {
+            formatHooks.add(0,hook);
+        }
+    }
+
+    /**
+     * Unregisters a format hook. Removes the hook from the list of format hooks.
+     *
+     * @param hook the format hook. Ignored if null.
+     */
+    public static void unregisterFormatHook(NameFormatterHook hook) {
+        if (hook == null) return;
+        if (formatHooks.contains(hook)) {
+            formatHooks.remove(hook);
+        }
+    }
 
     /** the default list of tags which are used as naming tags in relations */
     static public final String[] DEFAULT_NAMING_TAGS_FOR_RELATIONS = {"name", "ref", "restriction", "landuse", "natural",
@@ -140,6 +167,14 @@
             name += " (" + node.getCoor().latToString(CoordinateFormat.getDefaultFormat()) + ", " + node.getCoor().lonToString(CoordinateFormat.getDefaultFormat()) + ")";
         }
         name = decorateNameWithId(name, node);
+
+        for (NameFormatterHook hook: formatHooks) {
+            String hookResult = hook.checkFormat(node, name);
+            if (hookResult != null && !hookResult.isEmpty()) {
+                return hookResult;
+            }
+        }
+
         return name;
     }
 
@@ -216,6 +251,14 @@
             name += (name.length() > 0) ? " ("+nodes+")" : nodes;
         }
         name = decorateNameWithId(name, way);
+        
+        for (NameFormatterHook hook: formatHooks) {
+            String hookResult = hook.checkFormat(way, name);
+            if (hookResult != null && !hookResult.isEmpty()) {
+                return hookResult;
+            }
+        }
+
         return name;
     }
 
@@ -263,6 +306,14 @@
             name += ")";
         }
         name = decorateNameWithId(name, relation);
+
+        for (NameFormatterHook hook: formatHooks) {
+            String hookResult = hook.checkFormat(relation, name);
+            if (hookResult != null && !hookResult.isEmpty()) {
+                return hookResult;
+            }
+        }
+
         return name;
     }
 
@@ -355,6 +406,13 @@
         if (admin_level != null) {
             name += "["+admin_level+"]";
         }
+        
+        for (NameFormatterHook hook: formatHooks) {
+            String hookResult = hook.checkRelationTypeName(relation, name);
+            if (hookResult != null && !hookResult.isEmpty()) {
+                return hookResult;
+            }
+        }
 
         return name;
     }
Index: src/org/openstreetmap/josm/gui/NameFormatterHook.java
===================================================================
--- src/org/openstreetmap/josm/gui/NameFormatterHook.java	(revision 0)
+++ src/org/openstreetmap/josm/gui/NameFormatterHook.java	(revision 0)
@@ -0,0 +1,41 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui;
+
+import org.openstreetmap.josm.data.osm.INode;
+import org.openstreetmap.josm.data.osm.IRelation;
+import org.openstreetmap.josm.data.osm.IWay;
+
+public interface NameFormatterHook {
+
+    /**
+     * Check the relation type name. Return the corrected type name if needed, null otherwise.
+     * @param relation The relation.
+     * @param defaultName The default name generated by core.
+     * @return The corrected type name if needed, null otherwise.
+     */
+    public String checkRelationTypeName(IRelation relation, String defaultName);
+    
+    /**
+     * Check the node format. Return the corrected format if needed, null otherwise.
+     * @param node The node.
+     * @param defaultName The default name generated by core.
+     * @return The corrected format if needed, null otherwise.
+     */
+    public String checkFormat(INode node, String defaultName);
+    
+    /**
+     * Check the way format. Return the corrected format if needed, null otherwise.
+     * @param way The way.
+     * @param defaultName The default name generated by core.
+     * @return The corrected format if needed, null otherwise.
+     */
+    public String checkFormat(IWay node, String defaultName);
+
+    /**
+     * Check the relation format. Return the corrected format if needed, null otherwise.
+     * @param relation The relation.
+     * @param defaultName The default name generated by core.
+     * @return The corrected format if needed, null otherwise.
+     */
+    public String checkFormat(IRelation node, String defaultName);
+}
Index: src/org/openstreetmap/josm/gui/OsmPrimitivRenderer.java
===================================================================
--- src/org/openstreetmap/josm/gui/OsmPrimitivRenderer.java	(revision 4200)
+++ src/org/openstreetmap/josm/gui/OsmPrimitivRenderer.java	(working copy)
@@ -24,7 +24,7 @@
  * @author Frederik Ramm <frederik@remote.org>
  */
 public class OsmPrimitivRenderer implements ListCellRenderer, TableCellRenderer {
-    private DefaultNameFormatter formatter = new DefaultNameFormatter();
+    private DefaultNameFormatter formatter = DefaultNameFormatter.getInstance();
 
     /**
      * Default list cell renderer - delegate for ListCellRenderer operation