> 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>ד</g> <g ref="#dalet"/> <g ref="#dalet">ד</g> but <g/> would not be.