[Trinidad] cannot use tr:media for rendering a pdf

[Renzo Tomaselli]

Hi, I tried to render a pdf file through tr:media. No success, although 
no errors.
This works:

<tr:media source="/seattle.wmv">
this does not:

<tr:media source="/logo-simple.pdf"> even while adding 
contentType="application/pdf"

Both are rendered inside an <a> element though, while I expected using 
<object> or <embed>.
Can anybody explain me the difference between those cases ?
Thanks -- Renzo