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
*/
	String DIMENSION_VIEW_EXTENSION_NAME = "DimensionView"; 
	/**
	 * Extension name of level view.
	 */
	String LEVEL_VIEW_EXTENSION_NAME = "LevelView"; 
	/**
	 * Extension name of measure view.
	 */
	String MEASURE_VIEW_EXTENSION_NAME = "MeasureView"; 
	/**
	 * Extension name of crosstab cell.
	 */
	String CROSSTAB_CELL_EXTENSION_NAME = "CrosstabCell"; 
	/**
	 * Extension name of aggregation cell.
	 */
	String AGGREGATION_CELL_EXTENSION_NAME = "AggregationCell"; 
	/**
	 * Extension name of crosstab member value.
	 */
	String CROSSTAB_MEMBER_VALUE_EXTENSION_NAME = "CrosstabMemberValue"; 
	/**
	 * Extension name of header cell.
	 */
	
	/**
	 * Constants of row axis type.
	 */
	int ROW_AXIS_TYPE = 0;