Combines a group of variables into a string.

NOTE: By default <s:join> uses (space) as the glue for the joined variables.
    user name => Sed
    user last name => Seyedi
    user email => sed@sunsed.com
    user twitter => @sed_seyedi
<s:join vars="user *" glue=" — " />
Sed — Seyedi — sed@sunsed.com — @sed_seyedi 
☼ ☼ ☼ anotomy ☼ ☼ ☼
vars=""  names=""  wildcard=""  

A wildcard that matches the variables that you want to join.

glue=""  by=""  with=""  

Used as a separator of the joined items.