diff -r 000000000000 -r fb9019fb1bf7 src/net/fortuna/ical4j/model/TimeZoneRegistry.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/net/fortuna/ical4j/model/TimeZoneRegistry.java	Tue Feb 10 18:12:00 2015 +0100
@@ -0,0 +1,77 @@
+/**
+ * Copyright (c) 2012, Ben Fortuna
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  o Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ *  o Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ *  o Neither the name of Ben Fortuna nor the names of any other contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package net.fortuna.ical4j.model;
+
+/**
+ * $Id$
+ *
+ * Created on 18/09/2005
+ *
+ * Implementors provide a list of timezone definitions applicable for use
+ * with iCalendar objects.
+ * @author Ben Fortuna
+ */
+public interface TimeZoneRegistry {
+
+    /**
+     * Registers a new timezone for use with iCalendar objects. If a timezone
+     * with the same identifier is already registered this timezone will take
+     * precedence.
+     * @param timezone a timezone to be registered for use with iCalendar
+     * objects
+     */
+    void register(final TimeZone timezone);
+    
+    /**
+     * Registers a new timezone for use with iCalendar objects. If a timezone
+     * with the same identifier is already registered this timezone will take
+     * precedence.
+     * @param timezone a timezone to be registered for use with iCalendar
+     * objects
+     * @param update attempt to update the definition from any specified TZURL
+     * property if true
+     */
+    void register(final TimeZone timezone, boolean update);
+    
+    /**
+     * Clears all registered timezones.
+     */
+    void clear();
+    
+    /**
+     * Returns a timezone with the specified identifier.
+     * @param id a timezone identifier
+     * @return a timezone matching the specified identifier. If no timezone
+     * is registered with the specified identifier null is returned.
+     */
+    TimeZone getTimeZone(final String id);
+}