SVGサンプル / 図形のグループ化：symbol

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<symbol id="figs" fill="lightgreen" fill-opacity="0.5">
    <rect width="50" height="50" /<
    <rect x="20" y="20" width="50" height="50" /<
</symbol<

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    <rect width="50" height="50" /<
    <rect x="20" y="20" width="50" height="50" /<
</symbol<

<use x="10" y="10" xlink:href="#figs"/<
<use x="120" y="10" xlink:href="#figs2"/<

</svg>