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Named entities use a mnemonic character string instead of a numeric code. So the following is a named entity (ignore the spaces).
& n b s p ;
The equivalent numeric entity can be written in hexadecimal or decimal notation as follows:
& # 1 6 0 ;
or
& # X A 0 ;
The only named entities allowed in html5/epub3 are the original xml entities.
& a m p ;
& l t ;
& g t ;
and a few others.
All others must be in numeric form.
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