Bug 185931 Support to distinguish the week between Year-Week and Month-Week[1101]
Description: In our OLAP builder, the datetime dimension is divided into YEAR-QUARTER-MONTH-WEEK-DAY. When select all the levels, the WEEK should be the week(1 to 5) in one MONTH When select YEAR-WEEK levels, the WEEK should be the week(1 to 52) in one YEAR But now in our OLAP builder, the WEEK only belong to the MONTH, But not belong to the year, so if only select the YEAR-WEEK level, the result of crosstab is meaningless. The YEAR-DAY, MONTH-DAY and WEEK-DAY also have the same issues. we should define a rule to make sure the WEEK has a correct relationship of his parent
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
*             thrown if the resource is not found, or there are syntax
	 *             errors in the resource
	 */
	public CssStyleSheetHandle openCssStyleSheet( InputStream is )
			throws StyleSheetException
	{
		StyleSheetLoader loader = new StyleSheetLoader( );
		return loader.load( module, is ).handle( module );
	}
	/**
	 * Imports the selected styles in a <code>CssStyleSheetHandle</code> to
	 * the module. Each in the list is instance of
	 * <code>SharedStyleHandle</code> .If any style selected has a duplicate
	 * name with that of one style already existing in the report design, this
	 * method will rename it and then add it to the design.
	 * 
	 * @param stylesheet
	 *            the style sheet handle that contains all the selected styles
	 * @param selectedStyles
	 *            the selected style list
	 * 
	 */
	abstract public void importCssStyles( CssStyleSheetHandle stylesheet,
			List selectedStyles );
	/**
	 * Sets the theme to a report.
	 * 
	 * @param themeName
	 *            the name of the theme
	 * @throws SemanticException