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Perhaps they mean old style figures?
OpenType fonts have the option of having several varieties of numerals, which are usually:
- tabular lining (numbers which all set to the same width so they line up in tables and reach to cap height and set on the baseline)
- proportional lining (widths vary, reach to cap height and set on the baseline)
- tabular oldstyle (numbers which all set to the same width so they line up in tables and have ascenders and descenders w/ a main height around that of the x-height of the type)
- proportional oldstyle (widths vary and have ascenders and descenders w/ a main height around that of the x-height of the type)
Apparently epub doesn't make accessing opentype features easy, so one would have to use glyph id #s or some such if that's even possible, which will be ugly in the code and may interfere w/ copy-paste.
I just made a quick test in Adobe InDesign, but even though the font was embedded, old style figures weren't used. (124KB file to display 0123456789) --- so I guess this would be another win for .pdf
William
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