ContainerSlot slot = theme.getSlot( Theme.STYLES_SLOT );
ContainerSlot slot = theme.getSlot( IThemeModel.STYLES_SLOT );
	public List validate( Module module, DesignElement element )	{		if ( !( element instanceof Theme ) )			return Collections.EMPTY_LIST;		Theme theme = (Theme) element;		ContainerSlot slot = theme.getSlot( Theme.STYLES_SLOT );		List list = new ArrayList( );		Set set = new HashSet( );		for ( Iterator iter = slot.iterator( ); iter.hasNext( ); )		{			StyleElement style = (StyleElement) iter.next( );			String styleName = style.getName( );			if ( !set.contains( styleName ) )				set.add( style.getName( ) );			else				list.add( new NameException( theme, styleName,						NameException.DESIGN_EXCEPTION_DUPLICATE ) );		}		return list;	}