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
return result.toString( );
	}
	IOdaDataSourceDesign newExtendedDataSource( OdaDataSourceHandle source )
			throws BirtException
	{
		OdaDataSourceDesign dteSource = new OdaDataSourceDesign( source
				.getQualifiedName( ) );
		IBaseDataSourceEventHandler eventHandler = new DataSourceScriptExecutor(
				source, context );
		dteSource.setEventHandler( eventHandler );
		
		adaptBaseDataSource( source, dteSource );
		
		
		String driverName = source.getExtensionID( );
		if ( driverName == null || driverName.length( ) == 0 )
		{
			throw new EngineException(
					"Missing extenion id in data source definition, " + source.getName( ) ); 
		}
		dteSource.setExtensionID( driverName );
		
		Map staticProps = getExtensionProperties( source, source
				.getExtensionPropertyDefinitionList( ) );
		if ( staticProps != null && !staticProps.isEmpty( ) )
		{
			Iterator propNamesItr = staticProps.keySet( ).iterator( );
			while ( propNamesItr.hasNext( ) )
			{
				String propName = ( String ) propNamesItr.next( );