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Unicode guide
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== Algorithms == The Unicode standard defines a set of algorithms that interpret text according to the standard. In general the algorithms cover the following topics: *Looking up information about a code point *Breaking text in to smaller pieces *Changing the case of text * Normalizing and comparing text * Sorting and searching text * Editing and displaying text These tend to map cleanly to most text processing done with traditional character sets, with the largest change being that most algorithms operate on character sequences rather than individual characters. The act of associating code points with some kind of behaviour is known as interpretation. This interpretation varies depending on Unicode version, tailoring, and whether the application supports all of Unicode or just specific code points. This can be a worrying thought as there's a distinct lack of stability: Running code on one system may have a different output to code on another system depending on their Unicode versions and setup. This is a complicated problem without an easy solution short of never exchanging Unicode text with someone else. While Unicode does have a stability policy, it is aimed at people writing Unicode algorithms, not people using them. My advice is to treat the output of these algorithms as inherently unstable, and read your tool documentation to see what stability it guarantees.
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