encoding/xml: Default namespaces are missing

[gopherbot]

by chris.jones.yar:

http://play.golang.org/p/oyQAscuSEt

go version devel +f3ca7d5b1b0b Tue Mar 12 17:12:56 2013 -0700 windows/386

Expected output:
<Message xml:lang="en"><Msg>Hello</Msg></Message>

Actual output:
<Message xmlns:_1="http://www.w3.org/XML/1998/namespace";
_1:lang="en"><Msg>Hello</Msg></Message>

http://www.w3.org/TR/REC-xml-names/, near the end of section 3, "Namespace
constraint: Reserved Prefixes and Namespace Names."

"Other prefixes MUST NOT be bound to this namespace name"

[adg]

Comment 1:

Is this a regression or a long-standing issue?

Status changed to WaitingForReply.

[gopherbot]

Comment 2 by chris.jones.yar:

It's a long-standing issue that should have been addressed by
https://golang.org/cl/7227056/ which fixed
https://golang.org/issue/3526 .

[rsc]

Comment 3:

https://golang.org/cl/7777047

[rsc]

Comment 4:

This issue was closed by revision bdf8bf6.

Status changed to Fixed.