encoding/xml: can decode but not encode a DOCTYPE with an internal subset

[mhilton]

1. What version of Go are you using (go version)?
   go version go1.2.1 linux/amd64
2. What operating system and processor architecture are you using?
   linux amd64
3. What did you do?
   http://play.golang.org/p/ejQsFQ7BHN
4. What did you expect to see?
   EOF
5. What did you see instead?
   xml: EncodeToken of Directive containing > marker

It looks like the test in Encoder.EncodeToken is a little too strict. In general it would be good if the encoder could encode a stream of tokens received from the decoder.

[gopherbot]

CL https://golang.org/cl/11630 mentions this issue.