Bug 185898 ReportItemHandle needs to add two method: getAvailableDataBindingReferenceList and getDataBindingType.
ReportItemHandle needs to add two method: getAvailableDataBindingReferenceList and getDataBindingType. The first method provider the available ReportItem list of DataBindingReference. The second method provider the type of the DataBinding.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ReportItemHandle.java
}
	/**
	 * Gets TOC handle.
	 * 
	 * @return toc handle
	 */
	public TOCHandle getTOC( )
	{
		PropertyHandle propHandle = getPropertyHandle( IReportItemModel.TOC_PROP );
		if ( propHandle == null )
			return null;
		TOC toc = (TOC) propHandle.getValue( );
		if ( toc == null )
			return null;
		return (TOCHandle) toc.getHandle( propHandle );
	}
	/**
	 * Adds toc structure.
	 * 
	 * @param expression
	 *            toc expression
	 * @return toc handle
	 * @throws SemanticException
	 */
	public TOCHandle addTOC( String expression ) throws SemanticException
	{
		if ( StringUtil.isEmpty( expression ) )
			return null;
		TOC toc = StructureFactory.createTOC( expression );
		setProperty( IReportItemModel.TOC_PROP, toc );