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
adaptBaseDataSet( modelDataSet, dteDataSet );
		
		
		
		String queryTextBinding = modelDataSet
				.getPropertyBinding( OdaDataSet.QUERY_TEXT_PROP );
		if ( needPropertyBinding( ) && queryTextBinding != null
				&& queryTextBinding.length( ) > 0 )
		{
			dteDataSet
					.setQueryText( evaluatePropertyBindingExpr( queryTextBinding ) );
		} else
		{
			dteDataSet.setQueryText( modelDataSet.getQueryText( ) );
		}
		
		dteDataSet.setExtensionID( modelDataSet.getExtensionID( ) );
		
		dteDataSet.setPrimaryResultSetName( modelDataSet.getResultSetName( ) );
		
		Map staticProps = getExtensionProperties( modelDataSet, modelDataSet
				.getExtensionPropertyDefinitionList( ) );
		if ( staticProps != null && !staticProps.isEmpty( ) )
		{
			Iterator propNamesItr = staticProps.keySet( ).iterator( );
			while ( propNamesItr.hasNext( ) )
			{
				String propName = ( String ) propNamesItr.next( );
				assert ( propName != null );
				String propValue;