<?xml version="1.0" ?>
<!DOCTYPE svg SYSTEM "http://www.w3.org/Graphics/SVG/1.0">
<svg>
  <desc>Example of <textflow> controlling selection order
        of text strings.
  </desc>
  <defs>
    <textflow>
      <tref href="#T1"/>
      <tref href="#T3"/>
    </textflow>
    <textflow>
      <tref href="#T2"/>
      <tref href="#T4"/>
    </textflow>
  </defs>
  <textblock id="T1">
    <text x="100" y="100">123</text>
  </textblock>
  <textblock id="T2">
    <text x="100" y="200">ABC</text>
  </textblock>
  <textblock id="T3">
    <text x="150" y="100">456</text>
  </textblock>
  <textblock id="T4">
    <text x="150" y="200">DEF</text>
  </textblock>
</svg>