What is this MashUp?

stiamo creando un MashUp. . .

<gm:page title="Task List" authenticate="true"> <table width="100%"> <tr> <td width="50%"> <gm:list id="Projects" data="${app}/Projects" template="simpleProjects"/> </td> <td width="50%"> <gm:list id="tasks" data="${Projects}/tasks" template="simpleTasks"> <gm:handleEvent src="Projects"/> </gm:list> </td> </tr> </table> <gm:template id="simpleProjects"> <div repeat="true"> <gm:text ref="atom:title"/> <gm:editButtons/> </div> <gm:create label="New Project"/> </gm:template> <gm:template id="simpleTasks"> <table width="100%"> <tr repeat="true"> <td><gm:text ref="atom:title"/></td> <td><gm:date ref="gd:when/@startTime"/></td> <td><gm:editButtons deleteOnly="true"/></td> </tr> </table> <gm:create label="new task"/> </gm:template> </gm:page>