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/usr/share/doc/mkvtoolnix/examples/example-segmentinfo-1.xml is in mkvtoolnix 19.0.0-1.

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<?xml version="1.0" encoding="ISO-8859-1"?>

<!DOCTYPE Info SYSTEM "matroskasegmentinfo.dtd">

<!-- Using a segment info XML file the user can force the values of
     various elements of the "segment information" element. In this
     example several UID values are forced. Each must be 128 bits
     long.
  -->

<Info>
  <SegmentUID format="hex">00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F</SegmentUID>
  <NextSegmentUID format="hex">ff ee dd cc bb aa 99 88 77 66 55 44 33 22 11 00</NextSegmentUID>
  <PreviousSegmentUID format="hex">00 11 22 33 44 55 66 77 88 99 aa bb cc dd ee ff</PreviousSegmentUID>
  <SegmentFamily format="hex">11 00 11 11 11 22 11 33 11 44 11 55 11 66 11 77</SegmentFamily>
</Info>