Japanese has context-sensitive characters. For example, a symbol that resembles
— lengthens the vowel of the preceding character. The sort
order depends on the vowel. For example, when — appears after
ka (represented in Latin characters), the — indicates
a long a and is treated like an a in a sort. When
— is after ki, it indicates a long i
and is treated like an i in a sort. ka— is equivalent
to kaa in a sort, and ki— is equivalent to kii.
The characters are shown in a tree structure, with branches representing primary,
secondary, and tertiary sort levels. The primary, secondary, and tertiary sort
levels are a way of classifying characters. The sort level that is shown is
irrelevant to the sort order. The characters are sorted in the order that you
see from the top to the bottom of the screen. Each entry is called a node.
NOTE: The Unicode values (UTF-16) in the collation screens appear with an
x instead of a u.
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