Title element of SVG for popup tooltip

Dear SVG developers,

There is one issue with the "title" element in SVG which may be worth of your attention. I use title element extensively to serve as popup tooltip on mouse hover in the following manner:

<path><title>(Description of the path object)</title></path>

It works, at least in Mozilla Firefox, while iOS Safari apparently doesn't support popup tooltip yet. The problem is, for long and repetitive description, text of this particular element cannot be linked, so the following code doesn't work:

<defs><title id="asd">(Long description)</title></defs>
<path><use xlink:href="#asd"/></path>

(Namespace of xlink is present in the SVG element.) I do understand it's entirely up to the user agent (browser) to decide how to interpret the title content, but still I hope you guys could spend little bit time to look into this issue. Thank you.

Thomas