Multiple images per glyph

[bobm]

It says in the PhotoFont specification that it's possible for a glyph to have more than one image.  In the kerning section of the specification it allows you then to refer to a specific image in a glyph.  Aside from that I don't see any other reference to the notion of having multiple images per glyph.

My question is what does it mean when a glyph has multiple images and I need to retrieve the metrics or the image for that glyph? How do I know which image associated with the glyph to pick?  Are there any PhotoFonts out there that actually use this part of the spec? 

Thanks for your help,

bob

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