Bug 129144 Support suppressDuplicates property on table row in report engine
See 129143 for detail. This only needs to be supported for data item in a detail row of a table.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/ir/ReportItemDesign.java
* accept a visitor. see visit pattern.
	 * 
	 * @param visitor
	 */
	abstract public Object accept( IReportItemVisitor visitor , Object value);
	
	public Expression getTOC()
	{
		return toc;
	}
	
	public void setTOC(Expression expr)
	{
		this.toc = expr;
	}
	/**
	 * @return Returns the boo-kmark.
	 */
	public Expression getBookmark( )
	{
		return bookmark;
	}
	/**
	 * @param bookmark The book-mark to set.
	 */
	public void setBookmark( Expression bookmark )
	{
		this.bookmark = bookmark;
	}