diff -x '*entries' -x .DS_Store -Naur mkgmap/trunk/src/uk/me/parabola/mkgmap/osmstyle/actions/ValueBuilder.java /Users/thilo/work/mkgmap/trunk/src/uk/me/parabola/mkgmap/osmstyle/actions/ValueBuilder.java
--- mkgmap/trunk/src/uk/me/parabola/mkgmap/osmstyle/actions/StartWithFilter.java	1970-01-01 01:00:00.000000000 +0100
+++ /Users/thilo/work/mkgmap/trunk/src/uk/me/parabola/mkgmap/osmstyle/actions/StartWithFilter.java	2009-05-16 23:58:15.000000000 +0200
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2009 Thilo Hannemann
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ *  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.
+ */
+
+package uk.me.parabola.mkgmap.osmstyle.actions;
+
+/**
+ * Ensure that a name starts with a certain phrase if that phrase is not already part of that name.
+ *
+ * @author Thilo Hannemann
+ */
+public class StartWithFilter extends ValueFilter {
+	private final String phrase, searchPhrase;
+
+	public StartWithFilter(String arg) {
+		phrase = arg;
+		searchPhrase = arg.trim().toLowerCase();
+	}
+
+	public String doFilter(String value) {
+		if (value == null)
+			return null;
+		else if (value.toLowerCase().indexOf(searchPhrase) != -1)
+			return value;
+		else
+			return phrase.concat(value);
+	}
+}
diff -x '*entries' -x .DS_Store -Naur mkgmap/trunk/src/uk/me/parabola/mkgmap/osmstyle/actions/ValueBuilder.java /Users/thilo/work/mkgmap/trunk/src/uk/me/parabola/mkgmap/osmstyle/actions/ValueBuilder.java
--- mkgmap/trunk/src/uk/me/parabola/mkgmap/osmstyle/actions/ValueBuilder.java	2009-05-17 23:18:53.000000000 +0200
+++ /Users/thilo/work/mkgmap/trunk/src/uk/me/parabola/mkgmap/osmstyle/actions/ValueBuilder.java	2009-05-16 23:23:45.000000000 +0200
@@ -158,6 +158,8 @@
 			item.addFilter(new ConvertFilter(arg));
 		} else if (cmd.equals("subst")) {
 			item.addFilter(new SubstitutionFilter(arg));
+		} else if (cmd.equals("start-with")) {
+			item.addFilter(new StartWithFilter(arg));
 		} else if (cmd.equals("prefix")) {
 			item.addFilter(new PrependFilter(arg));
 		} else if (cmd.equals("highway-symbol")) {