Bug 179674 Support time dimension in model
When define time dimension in model, the "itTime" property will be set. However this is not enough. We also need to know to what precision the time value should be evaluated, say, year, month, day, etc. Model needs to be enhanced to support such requirement.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/olap/LevelHandle.java
setStringProperty( INTERVAL_RANGE_PROP, intervalRange );
	}
	/**
	 * Returns the level type of this level. The returned value is one of:
	 * 
	 * <ul>
	 * <li><code>LEVEL_TYPE_DYNAMIC</code>
	 * <li><code>LEVEL_TYPE_MIRRORED</code>
	 * </ul>
	 * 
	 * @return the level type
	 */
	public String getLevelType( )
	{
		return getStringProperty( LEVEL_TYPE_PROP );
	}
	/**
	 * Sets the level type. The input value is defined in
	 * <code>DesignChoiceConstants</code> and can be one of:
	 * 
	 * <ul>
	 * <li><code>LEVEL_TYPE_DYNAMIC</code>
	 * <li><code>LEVEL_TYPE_MIRRORED</code>
	 * </ul>
	 * 
	 * @param levelType
	 * @throws SemanticException
	 */
	public void setLevelType( String levelType ) throws SemanticException
	{