Removing files not present in DOM Level 3 Core.
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java/external/xdocs/dom/core/i18n.html
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java/external/xdocs/dom/core/i18n.html
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<!--
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Generated: Thu Nov 09 17:43:02 EST 2000 jfouffa.w3.org
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-->
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<html lang='en' xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>Accessing code point boundaries</title>
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<link rel='stylesheet' type='text/css' href='./spec.css' />
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<link rel='stylesheet' type='text/css' href='W3C-REC.css' />
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<link rel='next' href='idl-definitions.html' />
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<link rel='contents' href='Overview.html#contents' />
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<link rel='index' href='def-index.html' />
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<link rel='previous' href='changes.html' />
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</head>
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<body>
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<div class='navbar' align='center'><a accesskey='p'
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href='changes.html'>previous</a> <a accesskey='n'
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href='idl-definitions.html'>next</a> <a accesskey='c'
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href='Overview.html#contents'>contents</a> <a accesskey='i'
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href='def-index.html'>index</a>
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<hr title='Navigation area separator' />
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</div>
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<div class='noprint' style='text-align: right'>
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<p style='font-family: monospace;font-size:small'>13 November,
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2000</p>
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</div>
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<div class='div1'><a id="i18n" name='i18n'></a>
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<h1 id='i18n-h1' class='adiv1'>Appendix B: Accessing code point
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boundaries</h1>
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<dl>
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<dd>Mark Davis, IBM</dd>
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<dd>Lauren Wood, SoftQuad Software Inc.</dd>
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</dl>
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<div class='noprint'>
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<h2 id='table-of-contents'>Table of contents</h2>
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<ul class='toc'>
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<li class='tocline3'><a class='tocxref'
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href='#i18n-introduction'>2.1. Introduction</a></li>
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<li class='tocline3'><a class='tocxref' href='#i18n-methods'>2.2.
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Methods</a>
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<ul class='toc'>
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<li class='tocline4'><a
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href='#i18n-methods-StringExtend'>StringExtend</a></li>
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</ul>
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</li>
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</ul>
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</div>
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<div class='div2'><a id="i18n-introduction"
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name='i18n-introduction'></a>
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<h2 id='i18n-introduction-h2' class='adiv2'>B.1: Introduction</h2>
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<p>This appendix is an informative, not a normative, part of the
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Level 2 DOM specification.</p>
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<p>Characters are represented in Unicode by numbers called <i>code
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points</i> (also called <i>scalar values</i>). These numbers can
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range from 0 up to 1,114,111 = 10FFFF<sub>16</sub> (although some
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of these values are illegal). Each code point can be directly
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encoded with a 32-bit code unit. This encoding is termed UCS-4 (or
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UTF-32). The DOM specification, however, uses UTF-16, in which the
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most frequent characters (which have values less than
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FFFF<sub>16</sub>) are represented by a single 16-bit code unit,
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while characters above FFFF<sub>16</sub> use a special pair of code
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units called a <i>surrogate pair</i>. For more information, see [<a
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class='noxref' href='references.html#Unicode'>Unicode</a>] or the
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Unicode Web site.</p>
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<p>While indexing by code points as opposed to code units is not
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common in programs, some specifications such as XPath (and
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therefore XSLT and XPointer) use code point indices. For
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interfacing with such formats it is recommended that the
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programming language provide string processing methods for
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converting code point indices to code unit indices and back. Some
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languages do not provide these functions natively; for these it is
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recommended that the native <code>String</code> type that is bound
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to <a href='core.html#DOMString'><code>DOMString</code></a> be
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extended to enable this conversion. An example of how such an API
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might look is supplied below.</p>
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<p><b>Note:</b> Since these methods are supplied as an illustrative
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example of the type of functionality that is required, the names of
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the methods, exceptions, and interface may differ from those given
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here.</p>
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</div>
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<!-- div2 i18n-introduction -->
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<div class='div2'><a id="i18n-methods" name='i18n-methods'></a>
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<h2 id='i18n-methods-h2' class='adiv2'>B.2: Methods</h2>
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<dl>
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<dt><b>Interface <i><a id="i18n-methods-StringExtend"
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name='i18n-methods-StringExtend'>StringExtend</a></i></b></dt>
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<dd>
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<p>Extensions to a language's native String class or interface</p>
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<dl>
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<dt><br />
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<b>IDL Definition</b></dt>
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<dd>
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<div class='idl-code'>
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<pre>
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interface StringExtend {
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int findOffset16(in int offset32)
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raises(StringIndexOutOfBoundsException);
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int findOffset32(in int offset16)
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raises(StringIndexOutOfBoundsException);
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};
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</pre>
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</div>
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<br />
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</dd>
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<dt><b>Methods</b></dt>
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<dd>
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<dl>
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<dt><code class='method-name'><a
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id="i18n-methods-StringExtend-findOffset16"
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name='i18n-methods-StringExtend-findOffset16'>findOffset16</a></code></dt>
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<dd>
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<div class='method'>Returns the UTF-16 offset that corresponds to a
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UTF-32 offset. Used for random access.
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<p><b>Note:</b> You can always round-trip from a UTF-32 offset to a
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UTF-16 offset and back. You can round-trip from a UTF-16 offset to
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a UTF-32 offset and back if and only if the offset16 is not in the
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middle of a surrogate pair. Unmatched surrogates count as a single
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UTF-16 value.</p>
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<div class='parameters'><b>Parameters</b>
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<div class='paramtable'>
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<dl>
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<dt><code class='parameter-name'>offset32</code> of type
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<code>int</code></dt>
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<dd>UTF-32 offset.<br />
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</dd>
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</dl>
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</div>
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</div>
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<!-- parameters -->
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<div class='return'><b>Return Value</b>
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<div class='returntable'>
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<table
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summary='Layout table: the first cell contains the type of the return value, the second contains a short description'
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border='0'>
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<tr>
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<td valign='top'>
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<p><code>int</code></p>
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</td>
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<td>
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<p>UTF-16 offset</p>
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</td>
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</tr>
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</table>
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</div>
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</div>
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<!-- return -->
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<div class='exceptions'><b>Exceptions</b>
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<div class='exceptiontable'>
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<table
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summary='Layout table: the first cell contains the type of the exception, the second contains the specific error code and a short description'
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border='0'>
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<tr>
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<td valign='top'>
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<p><code>StringIndexOutOfBoundsException</code></p>
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</td>
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<td>
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<p>if <code>offset32</code> is out of bounds.</p>
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</td>
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</tr>
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</table>
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</div>
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</div>
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<!-- exceptions -->
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</div>
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<!-- method -->
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</dd>
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<dt><code class='method-name'><a
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id="i18n-methods-StringExtend-findOffset32"
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name='i18n-methods-StringExtend-findOffset32'>findOffset32</a></code></dt>
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<dd>
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<div class='method'>Returns the UTF-32 offset corresponding to a
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UTF-16 offset. Used for random access. To find the UTF-32 length of
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a string, use:
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<div class='eg'>
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<pre>
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len32 = findOffset32(source, source.length());
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</pre>
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</div>
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<p><b>Note:</b> If the UTF-16 offset is into the middle of a
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surrogate pair, then the UTF-32 offset of the <em>end</em> of the
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pair is returned; that is, the index of the char after the end of
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the pair. You can always round-trip from a UTF-32 offset to a
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UTF-16 offset and back. You can round-trip from a UTF-16 offset to
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a UTF-32 offset and back if and only if the offset16 is not in the
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middle of a surrogate pair. Unmatched surrogates count as a single
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UTF-16 value.</p>
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<div class='parameters'><b>Parameters</b>
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<div class='paramtable'>
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<dl>
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<dt><code class='parameter-name'>offset16</code> of type
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<code>int</code></dt>
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<dd>UTF-16 offset<br />
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</dd>
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</dl>
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</div>
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</div>
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<!-- parameters -->
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<div class='return'><b>Return Value</b>
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<div class='returntable'>
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<table
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summary='Layout table: the first cell contains the type of the return value, the second contains a short description'
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border='0'>
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<tr>
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<td valign='top'>
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<p><code>int</code></p>
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</td>
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<td>
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<p>UTF-32 offset</p>
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</td>
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</tr>
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</table>
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</div>
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</div>
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<!-- return -->
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<div class='exceptions'><b>Exceptions</b>
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<div class='exceptiontable'>
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<table
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summary='Layout table: the first cell contains the type of the exception, the second contains the specific error code and a short description'
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border='0'>
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<tr>
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<td valign='top'>
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<p><code>StringIndexOutOfBoundsException</code></p>
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</td>
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<td>
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<p>if offset16 is out of bounds.</p>
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</td>
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</tr>
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</table>
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</div>
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</div>
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<!-- exceptions -->
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</div>
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<!-- method -->
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</dd>
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</dl>
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</dd>
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</dl>
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</dd>
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</dl>
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</div>
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<!-- div2 i18n-methods --></div>
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<!-- div1 i18n -->
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<div class='navbar' align='center'>
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<hr title='Navigation area separator' />
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<a accesskey='p' href='changes.html'>previous</a> <a
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accesskey='n' href='idl-definitions.html'>next</a> <a
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accesskey='c' href='Overview.html#contents'>contents</a> <a
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accesskey='i' href='def-index.html'>index</a></div>
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</body>
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</html>
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