[1] [CITE[Extended Contact Attributes - Google Talk for Developers - Google Code]]
([TIME[2011-11-16 21:35:51 +09:00]] 版)
<http://code.google.com/intl/ja/apis/talk/jep_extensions/roster_attributes.html>

[2]
[PRE(XML example code)[
xmlns:gr='google:roster'
]PRE]

[3] [[Forrest]] は[[Google]][[検索]]の意味で使っています。