<asp:XmlDataSource ID="XmlDataSource1" runat="server" XPath="acronym/letter">
 <Data>
 <acronym>
 <letter char="A" description="Asynchronous" />
 <letter char="J" description="JavaScript" />
 <letter char="A" description="And" />
 <letter char="X" description="XML" />
 </acronym>
 </Data>
</asp:XmlDataSource>