Struts 2 comes with generic tags (control tags and data tags) and UI tags.

Struts 2有通用标记(控制标记和数据标记)以及UI标记。

youdao

Social data tags retrieve and format data to the application or user making the request.

社交标签可以检索到发出请求的应用程序或用户并将数据按一定格式传送过去。

youdao

Users then input contextual data tags like time of day, type of activity and the surrounding environmental conditions to allow them to track variables that may affect their focus.

ENGADGET

Colored squares on the data tags for airplanes on the controller's radar screen change as pilots respond so that controllers get an extra visual cue in case a pilot doesn't see a message.

WSJ: Texting While Flying: Help for Pilots

If viruses do appear in smart tags, said the researchers, they are likely to cause problems for companies that read data off the tags.

BBC: NEWS | Technology | Viruses leap to smart radio tags