ANSI Common Lisp 13 Characters 13.1 Character Concepts
13.1.10 Documentation of Implementation-Defined Scripts
An
implementation must document the
character scripts
it supports. For each
character script supported,
the documentation must describe at least the following:
-
Character labels, glyphs, and descriptions.
Character labels must be uniquely named using only Latin capital letters A--Z,
hyphen (-), and digits 0--9.
-
Reader canonicalization.
Any mechanisms by which read treats
different characters as equivalent must be documented.
-
The impact on char-upcase,
char-downcase,
and the case-sensitive format directives.
In particular, for each character with case,
whether it is uppercase or lowercase,
and which character is its equivalent in the opposite case.
-
The behavior of the case-insensitive functions
char-equal, char-not-equal,
char-lessp, char-greaterp,
char-not-greaterp, and char-not-lessp.
-
The behavior of any character predicates;
in particular, the effects of
alpha-char-p,
lower-case-p,
upper-case-p,
both-case-p,
graphic-char-p,
and
alphanumericp.
-
The interaction with file I/O, in particular,
the supported coded character sets (for example, ISO8859/1-1987)
and external encoding schemes supported are documented.