Dynamic xml (apsx)

Hi,
i have a very common issue, i searched but could not found.
The problem i am changing xml asset to aspx page which returns an xml. But gives error -> "Error: Unknown asset type  | aspx"

here is site xml:

Code:

<page id="our_philosophy" title="Our Philosophy" src="our_philosophy.swf">
<!--<asset id="thisXML" src="xml/our_philosophy.xml" />-->
<asset id="thisXML" src="http://projects.gricreative.com:8019/tr-TR/our-philosophy/6.aspx" />
</page>

how can i deal with this. thanks.

http://www.gaiaflashframework.com/wiki/index.php?title=Site_XML#type

thanks,
 i found that link too, but i dont know how to override what.

Type="XML" in asset node

thank you very much, solved problem.
i am trying to check documentation but i dont understand. but i learned as3 from adobe documentation mostly.
i dont wanna say anything for documentation, because people think me a gaia enemy.