Xml stylesheet makes xml data not display

I am playing w/xml.
I added this line to the .xml file

 <?xml-stylesheet type="text/css" href="assetsStylesheet.css"?>

when the line is added the xml data no longer displays on the screen. When i remove it displays again.
As far as i can tell there are no typos in it.
The css doesn’t have “display:none” anywhere in it. It only has

@charset "utf-8";
/* xml css Document */
html{
background:#ddd;
}
body {
  font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif; 
   /*font-weight: 300;*/
}
asset_collection{
}
asset{
display:block;
background:#000;
color:#fff;
}

Was wondering what i might be doing wrong?
TIA
D

never mind. got this one.

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