I'm trying to take a flat XML file and transform it so that it has some 
depth.  I played around trying to group witihin a group - 2 keys, nested 
for-each's... No luck.

I've looked at some newgroup listings about compound keys using concat - 
didn't really grasp it.

So, I want to take a flat XML file that looks like this:

<?xml version="1.0" encoding="utf-8"?>
<DataSet_Studio_Appt_Dates>
  <Studio_Appt_Date_Times>
    <bus_unit_id>2405</bus_unit_id>
    <sched_date>8/7/2007 12:00:00 AM</sched_date>
    <sched_day_text>Tue</sched_day_text>
    <sched_time>11:00:00</sched_time>
    <time_range_descr>Before Noon</time_range_descr>
  </Studio_Appt_Date_Times>
  <Studio_Appt_Date_Times>
    <bus_unit_id>2405</bus_unit_id>
    <sched_date>8/7/2007 12:00:00 AM</sched_date>
    <sched_day_text>Tue</sched_day_text>
    <sched_time>11:30:00</sched_time>
    <time_range_descr>Before Noon</time_range_descr>
  </Studio_Appt_Date_Times>
   <Studio_Appt_Date_Times>
    <bus_unit_id>2405</bus_unit_id>
    <sched_date>8/8/2007 12:00:00 AM</sched_date>
    <sched_day_text>Wed</sched_day_text>
    <sched_time>12:00:00</sched_time>
    <time_range_descr>Noon to 3PM</time_range_descr>
  </Studio_Appt_Date_Times>
  <Studio_Appt_Date_Times>
    <bus_unit_id>2405</bus_unit_id>
    <sched_date>8/8/2007 12:00:00 AM</sched_date>
    <sched_day_text>Wed</sched_day_text>
    <sched_time>13:00:00</sched_time>
    <time_range_descr>Noon to 3PM</time_range_descr>
  </Studio_Appt_Date_Times>
 <Studio_Appt_Date_Times>
    <bus_unit_id>2405</bus_unit_id>
    <sched_date>8/8/2007 12:00:00 AM</sched_date>
    <sched_day_text>Wed</sched_day_text>
    <sched_time>15:30:00</sched_time>
    <time_range_descr>3PM to 6PM</time_range_descr>
  </Studio_Appt_Date_Times>
  <Studio_Appt_Date_Times>
    <bus_unit_id>2405</bus_unit_id>
    <sched_date>8/8/2007 12:00:00 AM</sched_date>
    <sched_day_text>Wed</sched_day_text>
    <sched_time>16:00:00</sched_time>
    <time_range_descr>3PM to 6PM</time_range_descr>
  </Studio_Appt_Date_Times>
 </DataSet_Studio_Appt_Dates>

And group it by dates and time ranges so that it looks like this:

<Studio_Appt_Data>
  <bus_unit_id>2405</bus_unit_id>
    <Studio_Appt_Dates>
      <Studio_Appt_Date>8/7/2007 12:00:00 AM</Studio_Appt_Date>
      <Time_Ranges>
        <Time_Range>
          <time_range_str>Before Noon</time_range_str>
          <appt_times>			
            <appt_time>11:00</appt_time>
            <appt_time>11:30</appt_time>			
          </appt_times>
        </Time_Range>
    </Studio_Appt_Dates>
      <Studio_Appt_Date>8/8/2007 12:00:00 AM</Studio_Appt_Date>
      <Time_Ranges>
        <Time_Range>
          <time_range_str>Noon to 3PM</time_range_str>
          <appt_times>			
            <appt_time>12:00</appt_time>
            <appt_time>13:00</appt_time>			
          </appt_times>
        </Time_Range>
        <Time_Range>
          <time_range_str>3PM to 6PM</time_range_str>
          <appt_times>			
            <appt_time>15:30</appt_time>
            <appt_time>16:00</appt_time>			
          </appt_times>
        </Time_Range>
    </Studio_Appt_Dates>

Thanks!

Joel Brimm.