[VE][73] font-face "is not finished" in LibreOffice SVG export

Hello there. I exported a trivial slide from LibreOffice Impress, and 
validated it with your fine service https://validator.w3.org/check . 
Here it is http://www.skierpage.com/bugs/very_simple_slide_noscript.svg 
, minus 450kB of JavaScript (there's nothing visible in Firefox because 
the JavaScript "makes it work", though Inkscape will show the slide 
contents).

I expected some validation errors like SVG version mismatch and 
complaints about all the ooo attributes from OpenOffice.org SVG 
extension. However, I'm puzzled by

> Error [73]: "end tag for X which is not finished"
>
> Error /Line 21, Column 143/: end tag for "font-face" which is not 
> finished
>
from

<font-facefont-family="Liberation Sans embedded" units-per-em="2048" 
font-weight="normal" font-style="normal" ascent="1852" descent="423"/>

The validator's explanation suggests font-face element requires a child 
element, but the SVG 1.1 spec 
https://www.w3.org/TR/SVG11/fonts.html#FontFaceElement doesn't indicate 
what's required and the SVG 1.1 DTD 
https://www.w3.org/TR/SVG11/svgdtd.html is pretty impenetrable.

I tried nesting

         <font-face-src>
           <font-face-name name="Super Sans Bold"/>
         </font-face-src>

from the example font in 
https://www.w3.org/TR/SVG11/fonts.html#SVGFontsOverview inside the tag, 
and that didn't help.

I realize it's a lot to ask for the validator to introspect and explain 
why it's unhappy with an element, but is there a cheat sheet or guide to 
figuring out what attributes or child elements are required to make it 
happy?

Many, many thanks for this tool and all you do.
--
=S Page


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