Although it is currently not possible to directly include XML attribute values/content in grids and then export those values to Excel, there is a way to view the XML attribute values in a grid as display-only using readOnly="false". 

Example grid configuration:   

<Grid>
	<Options>
		<CellAutoHeight/>
	</Options>
	<Columns>
		<ItemNameColumn width="200"/>
		<ItemAttributeColumn type="ABCD" readOnly="false"/>
	</Columns>
	<Row/>
</Grid>

Example result: 

In the XML attribute cell, users can click on the button to view the XML attribute value/content.

With the release of R31, it is now possible to display XML attributes in grids and tables! 

Example:

Systemite Support