Originally Posted by Doitsu
Since adding an addtional href attribute will suppress the USAGE message all you have to do is test if this additional href will be ignored by older readers and apps.
For example:
<svg xmlns="http://www.w3.org/2000/svg" height="100%" preserveAspectRatio="xMidYMid meet" version="1.1" viewBox="0 0 800 600" width="100%" xmlns:xlink="http://www.w3.org/1999/xlink">
<image width="800" height="600" href="../Images/cover.jpg" xlink:href="../Images/cover.jpg"/>
</svg>
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