Emoji data in UCD xml ?

Markus Scherer markus.icu at gmail.com
Tue Nov 3 15:35:54 CST 2015

About http://www.unicode.org/L2/L2015/15299-ucd-emoji-props.pdf
which has

Emoji_Presentation (EP)
● Non_Emoji (NE)
● Default_Text (DT)
● Default_Emoji (DE)
● NA

Why do we need both Non_Emoji and NA? Can't Non_Emoji be the default for
all code points that are not mentioned in the data?

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