<?xml version="1.0" standalone="yes"?>
<svg width="4in" height="3in"
 xmlns = 'http://www.w3.org/Graphics/SVG/svg-19990412.dtd'>
  <defs>
    <textflow id="TF1">
      <t href="#T1"/>
      <t href="#T3"/>
    </textflow>
    <textflow id="TF2">
      <t href="#T2"/>
      <t href="#T4"/>
    </textflow>
  </defs>
  <text x="100" y="100" id="T1"><tf href="#TF1">123</tf></text>
  <text x="100" y="200" id="T2"><tf href="#TF2">ABC</tf></text>
  <text x="150" y="100" id="T3"><tf href="#TF1">456</tf></text>
  <text x="150" y="200" id="T4"><tf href="#TF2">DEF</tf></text></svg>
