Bug 176450 Support link to CSS Feature(Model Part)
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/StructureFactory.java
* 
	 * @param expression
	 *            expression value
	 * @return toc object
	 */
	public static TOC createTOC( String expression )
	{
		TOC toc = new TOC( );
		toc.setProperty( TOC.TOC_EXPRESSION, expression );
		return toc;
	}
	/**
	 * Creates an empty cube join condition structure.
	 * 
	 * @return an empty cube join condition structure.
	 */
	public static DimensionCondition createCubeJoinCondition( )
	{
		return new DimensionCondition( );
	}
	/**
	 * Creates a Rule structure.
	 * 
	 * @return a rule structure
	 */
	public static Rule createRule( )
	{
		return new Rule( );
	}
}