%@ taglib uri="http://jakarta.apache.org/taglibs/i18n-1.0" prefix="i18n" %>
<%@ page contentType="text/html; charset=utf-8" %>
The bundle tag provides no HTML output; it simply sets the bundle used by the rest of the i18n tags on the page. A baseName must be provided, and a locale is optional.
For this page, the locale has been provided as a runtime expression value that happens to be hardcoded to Locale.US. Any object could have been provided, for example, a database lookup could have been used.