diff -r 000000000000 -r fb9019fb1bf7 src/net/fortuna/ical4j/model/property/CalScale.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/net/fortuna/ical4j/model/property/CalScale.java	Tue Feb 10 18:12:00 2015 +0100
@@ -0,0 +1,135 @@
+/**
+ * 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;
+import net.fortuna.ical4j.util.CompatibilityHints;
+
+/**
+ * $Id$
+ * 
+ * Created: [Apr 6, 2004]
+ *
+ * Defines a CALSCALE iCalendar property.
+ * @author benf
+ */
+public class CalScale extends Property {
+
+    private static final long serialVersionUID = 7446184786984981423L;
+
+    /**
+     * Constant for Gregorian calendar representation.
+     */
+    public static final CalScale GREGORIAN = new ImmutableCalScale("GREGORIAN");
+
+    /**
+     * @author Ben Fortuna An immutable instance of CalScale.
+     */
+    private static final class ImmutableCalScale extends CalScale {
+
+        private static final long serialVersionUID = 1750949550694413878L;
+
+        /**
+         * @param value
+         */
+        private ImmutableCalScale(final String value) {
+            super(new ParameterList(true), value);
+        }
+
+        /**
+         * {@inheritDoc}
+         */
+        public void setValue(final String aValue) {
+            throw new UnsupportedOperationException(
+                    "Cannot modify constant instances");
+        }
+    }
+
+    private String value;
+
+    /**
+     * Default constructor.
+     */
+    public CalScale() {
+        super(CALSCALE, PropertyFactoryImpl.getInstance());
+    }
+
+    /**
+     * @param aValue a value string for this component
+     */
+    public CalScale(final String aValue) {
+        super(CALSCALE, PropertyFactoryImpl.getInstance());
+        this.value = aValue;
+    }
+
+    /**
+     * @param aList a list of parameters for this component
+     * @param aValue a value string for this component
+     */
+    public CalScale(final ParameterList aList, final String aValue) {
+        super(CALSCALE, aList, PropertyFactoryImpl.getInstance());
+        this.value = aValue;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public void setValue(final String aValue) {
+        this.value = aValue;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final String getValue() {
+        return value;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public final void validate() throws ValidationException {
+    	if (CompatibilityHints.isHintEnabled(CompatibilityHints.KEY_RELAXED_VALIDATION)) {
+            if (!GREGORIAN.getValue().equalsIgnoreCase(value)) {
+                throw new ValidationException("Invalid value [" + value + "]");
+            }
+    	}
+    	else {
+            if (!GREGORIAN.getValue().equals(value)) {
+                throw new ValidationException("Invalid value [" + value + "]");
+            }
+    	}
+    }
+}