Here's the way I see it. A Serb's a Serb (from Serbia). An Albanian, as refered to in this article, is someone who hails from Albania, or perhaps more likely in this case, is of Albanian descent living in Kosovo (a part of Serbia), and they are muslims. Kosovo has a majority of Albanians but is Serbian, and is extremely important to Serbia culturally and historically. A Kosovar is someone, Serbian or Albanian, living in Kosovo.
It's kind of like Southern California. Southern California's part of America, with Americans living there, but there's a majority of Mexicans (or Americans who identify with Mexico, and thus really aren't Americans). So, in this example, America would be Serbia, SoCal would be Kosovo, and Mexicans would be Albanians.
That's the way I see it at least. I could very well be wrong ;) I apologize if this came across as patronizing.
Whoops, looks like I was late.
Stupid is, as stupid does.
"A Serb's a Serb (from Serbia)."
The defintion of "a Serb" is a Serbian Orthodox Christian. The can be from Bosnia, Croatia, Montenegro or Serbia (including Kosovo)within the former Yugoslavia. Historically, they have always been spread all over the map. The Bosnian Serbs were actually baptized where they stood in Bosnia -- and were never "from Serbia".
But, from the standpoint of descibing only the issue in Kosovo, you are correct. The Serbs are from Serbia, which includes Kosovo.