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/core/DesignSession.java
if ( fileName == null )
			throw new IllegalArgumentException( "The file name must not be null" ); 
		initializeOptions( options );
		Module module = GenericModuleReader.getInstance( ).read( this,
				fileName,
				options );
		assert module instanceof Library || module instanceof ReportDesign;
		if ( module instanceof ReportDesign )
			designs.add( module );
		else
			libraries.add( module );
		return module;
	}
	/**
	 * Opens a library with the given library file name.
	 * 
	 * @param fileName
	 *            the file name of the library to open. This name must include
	 *            the file name with the filename extension.
	 * @return the opened library
	 * @throws DesignFileException
	 *             If the file is not found, or the file contains fatal errors.
	 */
	public Library openLibrary( String fileName ) throws DesignFileException
	{
		return openLibrary( fileName, (ModuleOption) null );
	}
	/**
	 * Opens a library with the given library file name.
	 *