Variable question: capture and increase value

Dear Friends,
I am attempting to count like values and add an increasing value to
the string. However, I am having a mental block and cannot seem to
figure out how to do this.

I am trying to do this to the attribute @CT (below).

Anyone have any suggestions?

Sincerely,
Mike Ferrando
Washington, DC

Input: ===
<PROGRAMS ID="C1002" CTS="2-43">
  <C4 PS="1"><D4 CT="2">California</D4>
    <C5 PS="1"><D5 CT="2">Oakland</D5>
      <C6 PS="1"><D6 CT="2">Methody Meetin House</D6></C6>
      <C6 PS="2"><D6 CT="2">Unitarian Church</D6></C6></C5>
    <C5 PS="2"><D5 CT="2">San Francisco</D5>
      <C6 PS="3"><D6 CT="2">First Congregational Church</D6></C6>
      <C6 PS="4"><D6 CT="2">Temple Emanu-el</D6></C6></C5></C4>
  <C4 PS="2"><D4 CT="3">Colorado</D4>
    <C5 PS="3"><D5 CT="3">Denver</D5>
      <C6 PS="5"><D6 CT="3">Saint John's
Cathedral</D6></C6></C5></C4>
  <C4 PS="3"><D4 CT="4">Connecticut</D4>
    <C5 PS="4"><D5 CT="4">Greenwich</D5>
      <C6 PS="6"><D6 CT="4">Christ Church</D6></C6></C5></C4>
  <C4 PS="5"><D4 CT="6">Illinois</D4>
    <C5 PS="18"><D5 CT="6">Chicago</D5>
      <C6 PS="28"><D6 CT="OV 3">Apollo Musical Club</D6></C6>
      <C6 PS="29"><D6 CT="6">Auditorium</D6></C6>
      <C6 PS="30"><D6 CT="7">Central Music Hall</D6></C6>
      <C6 PS="31"><D6 CT="7">First Congregational Church</D6></C6>
      <C6 PS="32"><D6 CT="43">First Methodist Episcopal
Church</D6></C6>
      <C6 PS="33"><D6 CT="43">First Presbyterian Church</D6></C6>
      <C6 PS="34"><D6 CT="43">Hershey Music Hall</D6></C6>
      <C6 PS="35"><D6 CT="7">McCormick's Hall</D6></C6>
      <C6 PS="36"><D6 CT="7">Orchestra Hall</D6></C6>
      <C6 PS="37"><D6 CT="8">Trinity Church</D6></C6>
      <C6 PS="38"><D6 CT="8">Unity Church</D6></C6>
      <C6 PS="39"><D6 CT="8">World's Columbian
Exposition</D6></C6></C5></C4>
</PROGRAMS>


Output: === (desired)
<PROGRAMS ID="C1002" CTS="2-43">
  <C4 PS="1"><D4 CT="2/1">California</D4>
    <C5 PS="1"><D5 CT="2/2">Oakland</D5>
      <C6 PS="1"><D6 CT="2/3">Methody Meetin House</D6></C6>
      <C6 PS="2"><D6 CT="2/4">Unitarian Church</D6></C6></C5>
    <C5 PS="2"><D5 CT="2/5">San Francisco</D5>
      <C6 PS="3"><D6 CT="2/6">First Congregational Church</D6></C6>
      <C6 PS="4"><D6 CT="2/7">Temple Emanu-el</D6></C6></C5></C4>
  <C4 PS="2"><D4 CT="3/1">Colorado</D4>
    <C5 PS="3"><D5 CT="3/2">Denver</D5>
      <C6 PS="5"><D6 CT="3/3">Saint John's
Cathedral</D6></C6></C5></C4>
  <C4 PS="3"><D4 CT="4/1">Connecticut</D4>
    <C5 PS="4"><D5 CT="4/2">Greenwich</D5>
      <C6 PS="6"><D6 CT="4/3">Christ Church</D6></C6></C5></C4>
  <C4 PS="5"><D4 CT="6/1">Illinois</D4>
    <C5 PS="18"><D5 CT="6/2">Chicago</D5>
      <C6 PS="28"><D6 CT="OV 3">Apollo Musical Club</D6></C6>
      <C6 PS="29"><D6 CT="6/3">Auditorium</D6></C6>
      <C6 PS="30"><D6 CT="7/1">Central Music Hall</D6></C6>
      <C6 PS="31"><D6 CT="7/2">First Congregational Church</D6></C6>
      <C6 PS="32"><D6 CT="43/1">First Methodist Episcopal
Church</D6></C6>
      <C6 PS="33"><D6 CT="43/2">First Presbyterian Church</D6></C6>
      <C6 PS="34"><D6 CT="43/3">Hershey Music Hall</D6></C6>
      <C6 PS="35"><D6 CT="7/3">McCormick's Hall</D6></C6>
      <C6 PS="36"><D6 CT="7/4">Orchestra Hall</D6></C6>
      <C6 PS="37"><D6 CT="8/1">Trinity Church</D6></C6>
      <C6 PS="38"><D6 CT="8/2">Unity Church</D6></C6>
      <C6 PS="39"><D6 CT="8/3">World's Columbian
Exposition</D6></C6></C5></C4>
</PROGRAMS>



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