diff -r 000000000000 -r fb9019fb1bf7 src/net/fortuna/ical4j/model/property/Priority.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/net/fortuna/ical4j/model/property/Priority.java	Tue Feb 10 18:12:00 2015 +0100
@@ -0,0 +1,239 @@
+/**
+ * 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.property;
+
+import net.fortuna.ical4j.model.ParameterList;
+import net.fortuna.ical4j.model.Property;
+import net.fortuna.ical4j.model.PropertyFactoryImpl;
+import net.fortuna.ical4j.model.ValidationException;
+
+/**
+ * $Id$
+ * 
+ * Created: [Apr 6, 2004]
+ *
+ * Defines a PRIORITY iCalendar component property.
+ * 
+ * <pre>
+ *     4.8.1.9 Priority
+ *     
+ *        Property Name: PRIORITY
+ *     
+ *        Purpose: The property defines the relative priority for a calendar
+ *        component.
+ *     
+ *        Value Type: INTEGER
+ *     
+ *        Property Parameters: Non-standard property parameters can be
+ *        specified on this property.
+ *     
+ *        Conformance: The property can be specified in a &quot;VEVENT&quot; or &quot;VTODO&quot;
+ *        calendar component.
+ *     
+ *        Description: The priority is specified as an integer in the range
+ *        zero to nine. A value of zero (US-ASCII decimal 48) specifies an
+ *        undefined priority. A value of one (US-ASCII decimal 49) is the
+ *        highest priority. A value of two (US-ASCII decimal 50) is the second
+ *        highest priority. Subsequent numbers specify a decreasing ordinal
+ *        priority. A value of nine (US-ASCII decimal 58) is the lowest
+ *        priority.
+ *     
+ *        A CUA with a three-level priority scheme of &quot;HIGH&quot;, &quot;MEDIUM&quot; and
+ *        &quot;LOW&quot; is mapped into this property such that a property value in the
+ *        range of one (US-ASCII decimal 49) to four (US-ASCII decimal 52)
+ *        specifies &quot;HIGH&quot; priority. A value of five (US-ASCII decimal 53) is
+ *        the normal or &quot;MEDIUM&quot; priority. A value in the range of six (US-
+ *        ASCII decimal 54) to nine (US-ASCII decimal 58) is &quot;LOW&quot; priority.
+ *     
+ *        A CUA with a priority schema of &quot;A1&quot;, &quot;A2&quot;, &quot;A3&quot;,
+ *         &quot;B1&quot;, &quot;B2&quot;, ...,
+ *        &quot;C3&quot; is mapped into this property such that a property value of one
+ *        (US-ASCII decimal 49) specifies &quot;A1&quot;, a property value of two (US-
+ *        ASCII decimal 50) specifies &quot;A2&quot;, a property value of three (US-ASCII
+ *        decimal 51) specifies &quot;A3&quot;, and so forth up to a property value of 9
+ *        (US-ASCII decimal 58) specifies &quot;C3&quot;.
+ *     
+ *        Other integer values are reserved for future use.
+ *     
+ *        Within a &quot;VEVENT&quot; calendar component, this property specifies a
+ *        priority for the event. This property may be useful when more than
+ *        one event is scheduled for a given time period.
+ *     
+ *        Within a &quot;VTODO&quot; calendar component, this property specified a
+ *        priority for the to-do. This property is useful in prioritizing
+ *        multiple action items for a given time period.
+ *     
+ *        Format Definition: The property is specified by the following
+ *        notation:
+ *     
+ *          priority   = &quot;PRIORITY&quot; prioparam &quot;:&quot; privalue CRLF
+ *          ;Default is zero
+ *     
+ *          prioparam  = *(&quot;;&quot; xparam)
+ *     
+ *          privalue   = integer       ;Must be in the range [0..9]
+ *             ; All other values are reserved for future use
+ *     
+ *        The following is an example of a property with the highest priority:
+ *     
+ *          PRIORITY:1
+ *     
+ *        The following is an example of a property with a next highest
+ *        priority:
+ *     
+ *          PRIORITY:2
+ *     
+ *        Example: The following is an example of a property with no priority.
+ *        This is equivalent to not specifying the &quot;PRIORITY&quot; property:
+ *     
+ *          PRIORITY:0
+ * </pre>
+ * 
+ * @author Ben Fortuna
+ */
+public class Priority extends Property {
+
+    private static final long serialVersionUID = -5654367843953827397L;
+
+    /**
+     * Undefined priority.
+     */
+    public static final Priority UNDEFINED = new ImmutablePriority(0);
+
+    /**
+     * High priority.
+     */
+    public static final Priority HIGH = new ImmutablePriority(1);
+
+    /**
+     * Medium priority.
+     */
+    public static final Priority MEDIUM = new ImmutablePriority(5);
+
+    /**
+     * Low priority.
+     */
+    public static final Priority LOW = new ImmutablePriority(9);
+
+    /**
+     * @author Ben Fortuna An immutable instance of Priority.
+     */
+    private static final class ImmutablePriority extends Priority {
+
+        private static final long serialVersionUID = 5884973714694108418L;
+
+        private ImmutablePriority(final int level) {
+            super(new ParameterList(true), level);
+        }
+
+        public void setValue(final String aValue) {
+            throw new UnsupportedOperationException(
+                    "Cannot modify constant instances");
+        }
+
+        public void setLevel(final int level) {
+            throw new UnsupportedOperationException(
+                    "Cannot modify constant instances");
+        }
+    }
+
+    private int level;
+
+    /**
+     * Default constructor.
+     */
+    public Priority() {
+        super(PRIORITY, PropertyFactoryImpl.getInstance());
+        level = UNDEFINED.getLevel();
+    }
+
+    /**
+     * @param aList a list of parameters for this component
+     * @param aValue a value string for this component
+     */
+    public Priority(final ParameterList aList, final String aValue) {
+        super(PRIORITY, aList, PropertyFactoryImpl.getInstance());
+        level = Integer.parseInt(aValue);
+    }
+
+    /**
+     * @param aLevel an int representation of a priority level
+     */
+    public Priority(final int aLevel) {
+        super(PRIORITY, PropertyFactoryImpl.getInstance());
+        level = aLevel;
+    }
+
+    /**
+     * @param aList a list of parameters for this component
+     * @param aLevel an int representation of a priority level
+     */
+    public Priority(final ParameterList aList, final int aLevel) {
+        super(PRIORITY, aList, PropertyFactoryImpl.getInstance());
+        level = aLevel;
+    }
+
+    /**
+     * @return Returns the level.
+     */
+    public final int getLevel() {
+        return level;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void setValue(final String aValue) {
+        level = Integer.parseInt(aValue);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final String getValue() {
+        return String.valueOf(getLevel());
+    }
+
+    /**
+     * @param level The level to set.
+     */
+    public void setLevel(final int level) {
+        this.level = level;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final void validate() throws ValidationException {
+        // TODO: Auto-generated method stub
+    }
+}