Bug 124067 When select the XML file, the relative path should be supported.
Description: When select the XML file, the relative path should be supported. Step to reproduce: 1. new a report 2. new a datasource and dataset based on a XML file 3. select the XML file, the file relative path should be used. Actual result: only the absolute path is supported. Expect result: the relative and absolute path are supported.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ModelDteApiAdapter.java
ColumnDefinition newColumn = new ColumnDefinition( modelColumnHint
				.getColumnName( ) );
		updateColumnDefn( newColumn, modelColumnHint );
		return newColumn;
	}
	/**
	 * Find the DtE columnDefn from the given list of columnDefns that matches
	 * the given columnName.
	 */
	private ColumnDefinition findColumnDefn( List columnDefns, String columnName )
	{
		assert columnName != null;
		if ( columnDefns == null )
			return null; 
		Iterator iter = columnDefns.iterator( );
		if ( iter == null )
			return null;
		
		
		while ( iter.hasNext( ) )
		{
			ColumnDefinition column = ( ColumnDefinition ) iter.next( );
			if ( columnName.equals( column.getColumnName( ) ) )
				return column;
		}
		return null;
	}
	int toDteDataType( String modelDataType )
	{
		if ( modelDataType == null )