diff -r f38b0ee7b1c1 -r 48be1ae93fd4 structs.go
--- a/structs.go	Mon Dec 26 18:07:14 2011 -0700
+++ b/structs.go	Tue Dec 27 15:36:07 2011 -0700
@@ -72,6 +72,13 @@
 	Mechanism []string
 }
 
+type auth struct {
+	XMLName xml.Name
+	Chardata string `xml:"chardata"`
+	Mechanism string `xml:"attr"`
+	Any *Unrecognized
+}
+
 type Unrecognized struct {
 	XMLName xml.Name
 }