Bug 184762 BIRT Model - Enhancments to the level defintion
xtab/org.eclipse.birt.report.item.crosstab.core/src/org/eclipse/birt/report/item/crosstab/core/ILevelViewConstants.java
/**
	 * Name of the property that indicates the sort expression and direction of
	 * this level.
	 */
	String SORT_PROP = "sort"; 
	/**
	 * Name of the property that defines the page break status.
	 */
	String PAGE_BREAK_BEFORE_PROP = "pageBreakBefore"; 
	/**
	 * Name of the property that defines the page break status.
	 */
	String PAGE_BREAK_AFTER_PROP = "pageBreakAfter"; 
	/**
	 * Name of the property that indicates whether aggregation header should be
	 * displayed before or after this level.
	 */
	String AGGREGATION_HEADER_LOCATION_PROP = "aggregationHeaderLocation"; 
	/**
	 * Name of the property that holds single crosstab cell to descript the
	 * contents for this level.
	 */
	String MEMBER_PROP = "member"; 
	/**
	 * Name of the property that holds single crosstav cell to show the
	 * aggregations header.
	 */
	String AGGREGATION_HEADER_PROP = "aggregationHeader"; 
}