Bug 161174 Expect to set/get interval range with a 'String' param in GroupHandle.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/GroupHandle.java
}
	/**
	 * Sets group start property of this group. Group start, in conjunction with
	 * Interval and IntervalRange, determines how data is divided into groups.
	 * 
	 * @param groupStart
	 *            group start property value.
	 * @throws SemanticException
	 *             if the property is locked.
	 * 
	 * @deprecated by {@link #setIntervalBase(String)}
	 */
	public void setGroupStart( String groupStart ) throws SemanticException
	{
		setIntervalBase( groupStart );
	}
	/**
	 * Return the group start property value of this group.
	 * 
	 * @return group start property value of this group.
	 * 
	 * @deprecated by {@link #getIntervalBase()}
	 */
	public String getGroupStart( )
	{
		return getIntervalBase( );
	}
	/**
	 * Sets the base of the interval property of this group.IntervalBase, in
	 * conjunction with Interval and IntervalRange, determines how data is