title: Query a specific list template with a web application scope
body: <p>I know that is is possible to query a specific site collection using the SPSiteDataQuery but I would like to perform the same operation within a whole web application. In fact, I would like to query a specific list template in a whole web application.</p>
  
  <p>I could loop over the site collections of the web application but it is really too much time consuming.</p>
  
  <p>Does anybody have an idea ?</p>