Suspects that dia cannot handle <g> tag properly. Any drawing objects
enclosed by <g> tag will be ignore. Example:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<svg width="100px" height="100px">
<g transform="scale(10 10)">
<rect style="fill: #ffffff" x="2.7" y="1.35" width="9.7" height="1.4"/>
<rect style="fill: none; stroke-width: 0.1; stroke: #000000" x="2.7"
y="1.35" width="9.7" height="1.4"/>
<text style="fill: #000000; text-anchor: middle; font-size: 1" x="7.55"
y="2.35">TokenizedTable</text>
<rect style="fill: #ffffff" x="2.7" y="2.75" width="9.7" height="0.4"/>
<rect style="fill: none; stroke-width: 0.1; stroke: #000000" x="2.7"
y="2.75" width="9.7" height="0.4"/>
<rect style="fill: #ffffff" x="2.7" y="3.15" width="9.7" height="1"/>
<rect style="fill: none; stroke-width: 0.1; stroke: #000000" x="2.7"
y="3.15" width="9.7" height="1"/>
<text style="fill: #000000; text-anchor: start; font-size: 1" x="2.85"
y="3.9">+getName(): const string </text>
</g>
</svg>