Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/css/CssStyleSheet.java
}
	/**
	 * Adds a style into the style sheet.
	 * 
	 * @param style
	 *            the style to add
	 */
	public void addStyle( DesignElement style )
	{
		assert styles.get( style.getName( ) ) == null;
		styles.put( style.getName( ), style );
	}
	/**
	 * Removes a style into the style sheet.
	 * 
	 * @param name
	 *            the name of the style
	 */
	public void removeStyle( String name )
	{
		assert styles.get( name ) != null;
		styles.remove( name );
	}
	/**
	 * Gets all the styles in the style sheet. Each one in the list is instance
	 * of <code>CSSStyle</code>.
	 * 
	 * @return all the styles in the style sheet
	 */
	public List getStyles( )