ATG has two JSP tag libraries, DSP and DSPEL. Both have similar syntax but DSPEL allows you to use JSTL.

Here’s a simple comparison of how you would use DSP versue how you would use DSPEL to do a simple RQL query.

DSPEL

<dspel:droplet name="/atg/dynamo/droplet/RQLQueryForEach">
  <dspel:param name="repository" bean="/betweengo/Repository"/>
  <dspel:param name="itemDescriptor" value="Merchant"/>
  <dspel:param name="queryRQL"
    value="name EQUALS \"${requestScope['nm']}\""/>
  <dspel:oparam name="empty">
    No merchant with the name "<c:out value="${requestScope['nm']}"/>".
  </dspel:oparam>
  <dspel:oparam name="output">
    Name: <dspel:valueof param="element.name"/>
  </dspel:oparam>
</dspel:droplet>

DSP

<% String query = "name EQUALS \"" + request.getAttribute("nm") + "\"";%>

<dsp:droplet name="/atg/dynamo/droplet/RQLQueryForEach">
  <dsp:param name="repository" bean="/betweengo/Repository"/>
  <dsp:param name="itemDescriptor" value="Merchant"/>
  <dsp:param name="queryRQL" value="<%= query %>"/>
  <dsp:oparam name="empty">
    No merchant with the name "<%= request.getAttribute("nm") %>".
  </dsp:oparam>
  <dsp:oparam name="output">
    Name: <dsp:valueof param="element.name"/>
  </dsp:oparam>
</dsp:droplet>