Hierarchy of Hardware Components (and hence LATC_XML nodes):

  <LATC_XML>
      <GEM>  Trigger
         <ROI/>  ACD region of interest
         <AOC/>  Miscellaneous trigger
         <SCH/>  Trigger engine schedule table
        <WIN/>  Trigger window
        <TAM/>  Trigger Accept Messges, prescales, zero-suppression.
        <TIE/>  Trigger Input Enables.
        </GEM>
      <AEM> ACD Electronics Module
        <ARC ID='[0-11] | BCAST'> ACD Readout Controller
          <AFE ID='[0-17] | BCAST'/> ACD Front-Ends
        </ARC>
      </AEM>
      <TEM ID='[0-15] | BCAST'> Tower Electronics Modules
        <TIC/>  Trigger Interface Controller
        <CCC ID='[0-3] | BCAST'> CAL Cable Controller
          <CRC ID='[0-3] | BCAST'> CAL Readout Controller
            <CFE ID='[0-11] | BCAST'/> CAL Front-Ends
          </CRC>
        </CCC>
        <TCC ID='[0-7] | BCAST'> TKR Cable Controller
          <TRC ID='[0-8] | BCAST'/> TKR Readout Controller
        </TCC>
        <SPT ID='[0-24] | BCAST'> TKR readout splits.
          <TFE ID='[0-23] | BCAST'> TKR Front-Ends.
            <TDC/> TKR Front-End DACs.
          </TFE>
        </SPT>
      </TEM>
    </LATC_XML>