The headers on the XML are not correct (from web-sniffer.net)
HTTP Response Header
Name Value Delim
Status: HTTP/1.1 200 OK
Date: Fri, 11 Jan 2013 18:38:04 GMT
P3P: policyref="http://info.yahoo.com/w3c/p3p.xml", CP="CAO DSP COR CUR ADM DEV TAI PSA PSD IVAi IVDi CONi TELo OTPi OUR DELi SAMi OTRi UNRi PUBi IND PHY ONL UNI PUR FIN COM NAV INT DEM CNT STA POL HEA PRE LOC GOV"
Content-Type: text/html
Age: 0
Connection: close
Server: YTS/1.19.11:
The Content-Type needs to be "text/xml"