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> Can <g> ever be empty? That is, can it be used to represent a
> glyph, or must it have content? The examples in the Guidelines all
> have content and g.content = text but I thought I'd check.

IIRC, <g> should have content or a ref= attribute (or both).

So the following should be OK:

   <g>&#x05D3;</g>
   <g ref="#dalet"/>
   <g ref="#dalet">&#x05D3;</g>

but 

   <g/>

would not be.