I've seen all over newsites have these XML files you can either download, or connect to, and they let you update your site with their headlines...One example, on /. (slashdot)...
http://slashdot.org/code.shtml

read Importing of Slashdot headlines

I'll be using PHP to do it, but was wondering how these XML files work as well..

THanks in advance, and if this is too broad, do tell


------------------
<A HREF="http://home.columbus.rr.com/bio/benchmarks.htm" TARGET=_blank>-=T'bird 1000@1224=- | -=768 Crucial PC133=- | -=GeForce2 MX 32mb eVGA=-
-=Abit KT7a-Raid=- | -=40gb ata/100 WD=- | -=Sound Blaster Live!=-</A>