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
assert !StringUtil.isBlank( propName );
		MetaDataDictionary dd = MetaDataDictionary.getInstance( );
		IPropertyDefn propDefn = dd.getStyle( ).getProperty( propName );
		assert propDefn != null;
		return defaultValues.get( propName );
	}
	/**
	 * Sets the algorithm of how to search a file. Any existing algorithm is
	 * discarded.
	 * 
	 * @param algorithm
	 *            the algorithm to be set.
	 */
	public void setResourceLocator( IResourceLocator algorithm )
	{
		assert algorithm != null;
		resourceLocator = algorithm;
	}
	/**
	 * Returns the installed search file algorithm. If no algorithm was
	 * installed, returns the default one.
	 * 
	 * @return the installed search file algorithm.
	 */
	public IResourceLocator getResourceLocator( )
	{
		assert resourceLocator != null;
		return resourceLocator;
	}
	/**