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
* 
	 * @return the book mark as a string
	 */
	public String getBookmark( )
	{
		return getStringProperty( IReportItemModel.BOOKMARK_PROP );
	}
	/**
	 * Sets the bookmark of the report item.
	 * 
	 * @param value
	 *            the property value to be set.
	 * @throws SemanticException
	 *             if the property is locked.
	 */
	public void setBookmark( String value ) throws SemanticException
	{
		setStringProperty( IReportItemModel.BOOKMARK_PROP, value );
	}
	/**
	 * Returns visibility rules defined on the report item. The element in the
	 * iterator is the corresponding <code>StructureHandle</code> that deal
	 * with a <code>Hide</code> in the list.
	 * 
	 * @return the iterator for visibility rules defined on this report item.
	 * 
	 * @see org.eclipse.birt.report.model.api.elements.structures.HideRule
	 */
	public Iterator visibilityRulesIterator( )
	{