Bug 136279 Structure and table datatypes should be hidden.
Description: Structure and table datatype should be hidden. Steps to reproduce: In table data binding, I saw structure and table two datatypes. They are not supported now, so they should be removed.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportDesignHandle.java
assert false;
		}
	}
	/**
	 * Sets the refresh rate when viewing the report.
	 * 
	 * @param rate
	 *            the refresh rate
	 */
	public void setRefreshRate( int rate )
	{
		try
		{
			setIntProperty( REFRESH_RATE_PROP, rate );
		}
		catch ( SemanticException e )
		{
			assert false;
		}
	}
	/**
	 * Returns a slot handle to work with the styles within the report. Note
	 * that the order of the styles within the slot is unimportant.
	 * 
	 * @return A handle for working with the styles.
	 */
	public SlotHandle getStyles( )
	{
		return getSlot( IReportDesignModel.STYLE_SLOT );
	}