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Pack purity -- prolog/pchar.pl
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Undocumented predicates

The following predicates are exported, but not or incorrectly documented.

 pchar(Arg1)
 pchar_upper(Arg1, Arg2)
 pchar_lower(Arg1, Arg2)
 ch_map(Arg1, Arg2, Arg3)
 ch(Arg1, Arg2, Arg3)
 pchar_type(Arg1, Arg2)
 pchar_code(Arg1, Arg2)
 pdif_char(Arg1, Arg2, Arg3)