SVG - adding a namespace

[mhebrard]

In my SVGs I use <textPath>
It allows me to define a path, then attached a text on the path. The text can be written on an arc or a curve...

<path id="map" d="M18,-62 A64,64,0,0,1,24,-59" style="pointer-events: none; opacity: 0;"></path>
<text text-anchor="left" dy="0.5ex" style="pointer-events: none;">
  <textPath xlink:href="#map">Text along the path</textPath>
</text>

It worked well on web browser, but to make it work in a standealone SVG (saved file) I need to add the namespace in the svg tag
<svg ... xmlns:xlink="http://www.w3.org/1999/xlink">

Is it a nice way to add this namespace in Project-Chi svg export ?