The XML document types obtained from the feed are uniquely identified
by their DTDs. We currently support documents with the following DTDs:
.IP \[bu] 2
-Heartbeat.dtd
+Auto_Racing_Schedule_XML.dtd
.IP \[bu]
-newsxml.dtd
+Heartbeat.dtd
.IP \[bu]
Injuries_Detail_XML.dtd
.IP \[bu]
injuriesxml.dtd
.IP \[bu]
+newsxml.dtd
+.IP \[bu]
Odds_XML.dtd
.IP \[bu]
weatherxml.dtd