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/ICrosstabConstants.java
/**
	 * Constants of column axis type.
	 */
	int COLUMN_AXIS_TYPE = 1;
	/**
	 * Constants of not effective axis type.
	 */
	int NO_AXIS_TYPE = -1;
	/**
	 * Measure direction constants.
	 */
	String MEASURE_DIRECTION_HORIZONTAL = "horizontal"; 
	String MEASURE_DIRECTION_VERTICAL = "vertical"; 
	/**
	 * Page layout constants.
	 */
	String PAGE_LAYOUT_DOWN_THEN_OVER = "down then over"; 
	String PAGE_LAYOUT_OVER_THEN_DOWN = "over then down"; 
	/**
	 * Aggregation location constants.
	 */
	String AGGREGATION_HEADER_LOCATION_BEFORE = "before"; 
	String AGGREGATION_HEADER_LOCATION_AFTER = "after"; 
	String CROSSTAB_SELECTOR = "crosstab"; 
	String CROSSTAB_CELL_SELECTOR = "crosstab-cell"; 
	String CROSSTAB_HEADER_SELECTOR = "crosstab-header"; 
	String CROSSTAB_DETAIL_SELECTOR = "crosstab-detail"; 
	String DEFAULT_MEASURE_FUNCTION = DesignChoiceConstants.MEASURE_FUNCTION_SUM;
}