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<defs>
  <textflow id="TF1">
    <t href="#T1"/>
    <t href="#T3"/>
  </textflow>
  <textflow id="TF2">
    <t href="#T2"/>
    <t href="#T4"/>
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<text x="100" y="100" id="T1">
  <tf href="#TF1">123</tf>
</text>
<text x="100" y="200" id="T2">
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</text>
<text x="150" y="100" id="T3">
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</text>
<text x="150" y="200" id="T4">
  <tf href="#TF2">DEF</tf>
</text>

</svg>