Teaser Export DXML

For my books I often use the Export DXML Modul.
Would be nice if the Excerpt could be included in the teaser section:

[...]
<title>E-Book</title>
<teaser> </teaser>
<content>
<p><strong>Introduction</strong><p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh euismod tincidunt ut laoreet dolore magna aliquam era
[...]

Tia.
vg