JSP fragment, tag handlers store/retrieve values in the JspContext associated with the
 fragment.
 <p>
 Note that tag library developers and page authors should not generate JspFragment implementations manually.
 <p>
 <i>Implementation Note</i>: It is not necessary to generate a separate class for each fragment. One possible
 implementation is to generate a single helper class for each page that implements JspFragment. Upon construction, a
 discriminator can be passed to select which fragment that instance 