Bug 128166 the xml data can be displayed incorrectly
Description: the xml data can be displayed incorrectly Steps to reproduce: 1. import the attached report design file. 2. set a table mapping as '//Book' 3. add a column mapping '../@location' 4. save and preview. Actual result: the 'Sunderland' is displayed Expect result: the 'Paris' is displayed
data/org.eclipse.birt.report.data.oda.xml/src/org/eclipse/birt/report/data/oda/xml/util/RelationInformation.java
* Return the back ref number of a column in certain table.
	 * 
	 * @param tableName
	 * @param columnName
	 * @return
	 */
	public int getTableNestedColumnBackRefNumber( String tableName, String columnName )
	{
		return ( (TableInfo) this.tableInfos.get( tableName ) ).getBackRefNumber( columnName );
	}
	
	/**
	 * Return the type of a column in certain table.
	 * 
	 * @param tableName
	 * @param columnName
	 * @return
	 */
	public String getTableColumnType( String tableName, String columnName )
	{
		return ( (TableInfo) this.tableInfos.get( tableName ) ).getType( columnName );
	}
	/**
	 * Return the array of column names of certain table.
	 *  
	 * @param tableName
	 * @return
	 */
	public String[] getTableColumnNames( String tableName )
	{