Characters have only one standardized attribute: a code. A character's code is a non-negative integer. This code is composed from a character script and a character label in an implementation-dependent way. See the functions char-code and code-char.
Additional, implementation-defined attributes of characters are also permitted so that, for example, two characters with the same code may differ in some other, implementation-defined way.
For any implementation-defined attribute there is a distinguished value called the null value for that attribute. A character for which each implementation-defined attribute has the null value for that attribute is called a simple character. If the implementation has no implementation-defined attributes, then all characters are simple characters.
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