63 lines
4.1 KiB
HTML
63 lines
4.1 KiB
HTML
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html
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PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html lang="en-us" xml:lang="en-us">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<meta name="security" content="public" />
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<meta name="Robots" content="index,follow" />
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<meta http-equiv="PICS-Label" content='(PICS-1.1 "http://www.icra.org/ratingsv02.html" l gen true r (cz 1 lz 1 nz 1 oz 1 vz 1) "http://www.rsac.org/ratingsv01.html" l gen true r (n 0 s 0 v 0 l 0) "http://www.classify.org/safesurf/" l gen true r (SS~~000 1))' />
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<meta name="DC.Type" content="concept" />
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<meta name="DC.Title" content="UTF-16" />
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<meta name="abstract" content="UTF-16 is an encoding of Unicode in which each character is composed of either one or two 16-bit elements." />
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<meta name="description" content="UTF-16 is an encoding of Unicode in which each character is composed of either one or two 16-bit elements." />
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<meta name="DC.Relation" scheme="URI" content="rbagsunicodeucs2.htm" />
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<meta name="DC.Relation" scheme="URI" content="http://www.unicode.org" />
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<meta name="DC.Relation" scheme="URI" content="rbagsucs2.htm" />
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<meta name="copyright" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Rights.Owner" content="(C) Copyright IBM Corporation 1998, 2006" />
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<meta name="DC.Format" content="XHTML" />
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<meta name="DC.Identifier" content="rbagsutf16" />
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<meta name="DC.Language" content="en-us" />
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<link rel="stylesheet" type="text/css" href="./ibmdita.css" />
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<link rel="stylesheet" type="text/css" href="./ic.css" />
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<title>UTF-16</title>
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</head>
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<body id="rbagsutf16"><a name="rbagsutf16"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">UTF-16</h1>
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<div><p>UTF-16 is an encoding of Unicode in which each character is composed
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of either one or two 16-bit elements.</p>
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<p>The operating system supports UTF-16 encoding with
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CCSID 1200.</p>
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<p>Unicode was originally designed as a pure 16-bit encoding, aimed at representing
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all modern scripts. Over time, and especially after the addition of over 14
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500 composite characters for compatibility with established sets, it became
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clear that 16 bits were not sufficient for most users. Out of this arose UTF-16.</p>
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<p>UTF-16 allows access to about 60 000 characters as single Unicode 16-bit
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units. It can access an additional 1 000 000 characters by a mechanism known
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as surrogate pairs.</p>
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<p>Two ranges of Unicode code values are reserved for the high (first) and
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low (second) values of these pairs. Highs are from 0xD800 to 0xDBFF, and lows
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from 0xDC00 to 0xDFFF. Because the most common characters have already been
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encoded in the first 64 000 values, the characters requiring surrogate pairs
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are relatively rare.</p>
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<p>UTF-16 is extremely well designed as the best compromise between handling
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and space, and all commonly used characters can be stored with one code unit
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per code point. This is the default encoding for Unicode.</p>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rbagsunicodeucs2.htm" title="Unicode is a standard that precisely defines a character set as well as a small number of encodings for it. It enables you to handle text in any language efficiently. It allows a single application to work for a global audience.">Work with Unicode</a></div>
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</div>
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<div class="relconcepts"><strong>Related concepts</strong><br />
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<div><a href="http://www.unicode.org" target="_blank">Unicode</a></div>
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<div><a href="rbagsucs2.htm" title="Because the UCS-2 standard is limited to 65 535 characters, and the data processing industry needs over 94 000 characters, the UCS-2 standard is in the process of being superseded by the Unicode UTF-16 standard.">UCS-2 and its relationship to Unicode</a></div>
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</div>
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</div>
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</body>
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</html>
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