Collaboration-oriented websites require a human-friendly markup language for easy entry of formatted text in forum posts, wiki pages, blogs, comments, etc. Seam provides the <s:formattedText/> control for display of formatted text that conforms to the Seam Text language. Seam Text is implemented using an ANTLR-based parser. You don't need to know anything about ANTLR to use it, however.
[2] Bug 1198433 – Replace Seam Text with CommonMark Markdown (2018-06-18 02:57:52 +09:00) <https://bugzilla.redhat.com/show_bug.cgi?id=1198433>