Collect all issue or bugzilla related to xml-namespacesupporte

[cyanrose-c]

This issue collect ALL the issue or bugzilla related to xml-namespacesupporte to ensure this repo can track all the problems about xml-namespacesupporte.

The below comment should contain problem description and the related link.

1 problem title use markdown link format (problem title)[problem link]
1 problem desciption use markdown code block format

If this problem is already solved in this repo, I will mark solved status of this problem. If not, I will create new issue to track this problem.

[cyanrose-c]

1 WWW :: RobotRules中的错误 ：
#https://rt.cpan.org/Ticket/Display.html?id=23895

2 不适用于用户代理名称中的斜杠（/）
#https://rt.cpan.org/Ticket/Display.html?id=116806

3 额外的Googlebot不兼容
#https://rt.cpan.org/Ticket/Display.html?id=99387

4 像googlebot这样的robots.txt的WWW-RobotRules解析规则
#https://rt.cpan.org/Ticket/Display.html?id=68219