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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"
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<td class="icon"><a href="http://www.unicode.org"><img border="0"
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alt="[Unicode]" width="34" height="33"></a> <a
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<h1>UNICODE CHARACTER DATABASE</h1>
<table border="1" cellspacing="2" cellpadding="0" height="87" width="100%">
<tr>
<td valign="TOP" width="144">Revision</td>
<td valign="TOP">3.1.0</td>
</tr>
<tr>
<td valign="TOP" width="144">Authors</td>
<td valign="TOP">Mark Davis and Ken Whistler</td>
</tr>
<tr>
<td valign="TOP" width="144">Date</td>
<td valign="TOP">2001-02-28</td>
</tr>
<tr>
<td valign="TOP" width="144">This Version</td>
<td valign="TOP"><a
href="http://http://www.unicode.org/Public/3.1-Update/UnicodeCharacterDatabase-3.1.0.html">http://www.unicode.org/Public/3.1-Update/UnicodeCharacterDatabase-3.1.0.html</a></td>
</tr>
<tr>
<td valign="TOP" width="144">Previous Version</td>
<td valign="TOP"><a
href="http://www.unicode.org/Public/3.0-Update1/UnicodeCharacterDatabase-3.0.1.html">http://www.unicode.org/Public/3.0-Update1/UnicodeCharacterDatabase-3.0.1.html</a></td>
</tr>
<tr>
<td valign="TOP" width="144">Latest Version</td>
<td valign="TOP"><a
href="http://www.unicode.org/Public/UNIDATA/UnicodeCharacterDatabase.html">http://www.unicode.org/Public/UNIDATA/UnicodeCharacterDatabase.html</a></td>
</tr>
</table>
<h3><br>
S<i>ummary</i></h3>
<blockquote>
<p><i>This document describes the format and content of the Unicode Character
Database (UCD)</i></p>
</blockquote>
<h3><i>Status</i></h3>
<blockquote>
<p><i>The file and the files described herein are part of the Unicode
Character Database and are governed by the <a href="#UCD_Terms">UCD Terms of
Use</a> given below.</i></p>
<p><i>The <a href="#References">References</a> provide related information
that is useful in understanding this document.</i></p>
<p><i><b>Warning: </b>the information in this file does not completely
describe the use and interpretation of Unicode character properties and
behavior. It must be used in conjunction with the data in the other files in
the Unicode Character Database, and relies on the notation and definitions
supplied in <a
href="http://www.unicode.org/unicode/standard/versions/Unicode3.0.html">The
Unicode Standard</a>. All chapter references are to Version 3.1.0 of the
standard.</i></p>
</blockquote>
<h2>Introduction</h2>
<p>The Unicode Character Database (UCD) is a set of files that define the
Unicode character properties and internal mappings. This document describes the
files that are part of <a href="http://www.unicode.org/unicode/reports/tr27/">The
Unicode Standard, Version 3.1</a> [<a href="#U3.1">U3.1</a>]. The main changes
in this version are:</p>
<ul>
<li>All of the data files have been updated to account for the large number of
additional characters in Unicode 3.1.</li>
<li>PropList.txt has been extensively reorganized and reformatted.</li>
<li>Scripts.txt has been added to the UCD.</li>
<li>A large number of informative derived property files have been added to
the UCD.</li>
</ul>
<p><i>Files in the UCD use a common format unless otherwise specified. For
details, see <a href="#UCD_File_Format">UCD File Format</a>.</i></p>
<h2><a name="Conformance">Conformance</a></h2>
<p>For information on the meaning and application of the terms normative and
informative, see "Chapter 4, Character Properties (revision)" in <a
href="http://www.unicode.org/unicode/reports/tr27/#conformance">UAX #27, Unicode
3.1</a>.</p>
<p>Some informative data files contain derived properties, properties that can
be derived from other properties in the UCD. The derived properties that are
computed from solely normative properties are themselves normative, while the
others are informative.</p>
<h2>UCD Files</h2>
<p>The following table summarizes the files in the Unicode Character Database.
For more information about these files, see the referenced technical
report(s), files, or section of Unicode Standard, Version 3.1.</p>
<table border="1" cellspacing="0" cellpadding="4">
<tr>
<th>".txt" File</th>
<th>Description</th>
<th align="center">N/I</th>
<th>Summary</th>
</tr>
<tr>
<td>ArabicShaping</td>
<td>Section 8.2</td>
<td align="center">N</td>
<td>Basic Arabic and Syriac character shaping properties, such as initial,
medial and final shapes.</td>
</tr>
<tr>
<td>BidiMirroring</td>
<td><a href="http://www.unicode.org/unicode/reports/tr9/">UAX #9</a></td>
<td align="center">I</td>
<td>Properties for substituting characters in an implementation of
bidirectional mirroring.</td>
</tr>
<tr>
<td>Blocks</td>
<td>Chapter 14</td>
<td align="center">N</td>
<td>List of block names.</td>
</tr>
<tr>
<td>CaseFolding</td>
<td><a href="http://www.unicode.org/unicode/reports/tr21/">UTR #21</a></td>
<td align="center">N</td>
<td>Mapping from characters to their case-folded forms. This is an
informative file containing normative derived properties.
<p><i>Derived from UnicodeData and SpecialCasing.</i></p>
</td>
</tr>
<tr>
<td>CompositionExclusions</td>
<td><a href="http://www.unicode.org/unicode/reports/tr15/">UAX #15</a></td>
<td align="center">N</td>
<td>Properties for normalization.</td>
</tr>
<tr>
<td><i>DerivedXXX</i></td>
<td>DerivedProperties.html</td>
<td align="center">N/I</td>
<td>Various informative derived files, described in the documentation file.
Some of the derived properties are normative and some are informative.</td>
</tr>
<tr>
<td>EastAsianWidth</td>
<td><a href="http://www.unicode.org/unicode/reports/tr11/">UAX #11</a></td>
<td align="center">I</td>
<td>Properties for determining the choice of wide vs. narrow glyphs in East
Asian contexts.</td>
</tr>
<tr>
<td>Index</td>
<td>Chapter 14</td>
<td align="center">I</td>
<td>Index to Unicode characters, as printed in the Unicode Standard. (See <a
href="#Update_Note">Update Note</a>.)</td>
</tr>
<tr>
<td>Jamo</td>
<td>Chapter 4</td>
<td align="center">N</td>
<td>List of Jamo short names, used in deriving HANGUL SYLLABLE names
algorithmically.</td>
</tr>
<tr>
<td>LineBreak</td>
<td><a href="http://www.unicode.org/unicode/reports/tr14/">UAX #14</a></td>
<td align="center">N/I</td>
<td>Properties for line breaking.</td>
</tr>
<tr>
<td>NamesList</td>
<td>Chapter 14</td>
<td align="center">I</td>
<td>This file duplicates some of the material in the UnicodeData file, and
adds annotations used in the character charts.</td>
</tr>
<tr>
<td>NormalizationTest</td>
<td><a href="http://www.unicode.org/unicode/reports/tr15/">UAX #15</a></td>
<td align="center">N</td>
<td>Test file for conformance to Unicode Normalization Forms.</td>
</tr>
<tr>
<td>PropList</td>
<td>PropList.html</td>
<td align="center">N/I</td>
<td>Extended character properties</td>
</tr>
<tr>
<td>Scripts</td>
<td><a href="http://www.unicode.org/unicode/reports/tr24/">UTR #24</a></td>
<td align="center">I</td>
<td>Default scripts values for use in regular expressions.</td>
</tr>
<tr>
<td>SpecialCasing</td>
<td>Chapter 4,<br>
<a href="http://www.unicode.org/unicode/reports/tr21/">UTR #21</a></td>
<td align="center">N</td>
<td>List of properties required for full case mapping.</td>
</tr>
<tr>
<td>UnicodeData</td>
<td>UnicodeData.html,<br>
Chapter 4,<br>
<a href="http://www.unicode.org/unicode/reports/tr21/">UTR #21</a>,<br>
<a href="http://www.unicode.org/unicode/reports/tr15/">UAX #15</a></td>
<td align="center">N/I</td>
<td>The main file in the UCD. </td>
</tr>
<tr>
<td>Unihan</td>
<td>Unihan.txt</td>
<td align="center">N/I</td>
<td>Extended properties of Han (CJK) characters. (See <a href="#Format_Note">Format
Note</a>.)</td>
</tr>
</table>
<blockquote>
<p><b><a name="Update_Note">Update Note</a>: </b>The information in Index.txt
files matches the appropriate version of the book. Changes in the Unicode
Character Database since then may not be reflected in these files, since they
are primarily of archival interest.</p>
<p><b><a name="Format_Note">Format Note</a>: </b>The file data format differs
from the standard format, and is described in the header of the file. The
header also describes which properties are informative and which are
normative.</p>
</blockquote>
<h2><a name="UCD_File_Format">UCD File Format</a></h2>
<p>Files in the UCD use the following format, unless otherwise specified.</p>
<ul>
<li>Each line of data consists of fields separated by semicolons. The fields
are numbered starting with zero. Code points are expressed as hexadecimal
numbers with four to six digits. They are written without "U+".
Within a sequence of code points, spaces are used for separation. Leading
and trailing spaces within a field are not significant.</li>
</ul>
<ul>
<li>The first field (0) of each line in the Unicode Character Database files
represents a code point or range. The remaining fields (1..n) are properties
associated with that code point.</li>
</ul>
<ul>
<li>A range of code points is specified by the form "X..Y". Each
code point from X to Y has the associated properties. For example:</li>
</ul>
<blockquote>
<pre>0000..007F; Basic Latin
0080..00FF; Latin-1 Supplement
1680 ; White_space # Zs OGHAM SPACE MARK
2000..200A; White_space # Zs [11] EN QUAD..HAIR SPACE</pre>
</blockquote>
<ul>
<li>Hash marks ("#") are used to indicate comments: all characters
from the hash mark to the end of the line are comments, and disregarded when
parsing data. In many files, the comments on data lines use a common format.</li>
</ul>
<blockquote>
<pre>00BC..00BE ; numeric # No [3] VULGAR FRACTION ONE QUARTER..VULGAR FRACTION THREE QUARTERS</pre>
</blockquote>
<ul>
<li>The first part of the comment is the UCD general category. The symbol
"L&" indicates characters of type Lu, Ll, or Lt. The code
point ranges are calculated so that they all have the same General Category
(or L&). While this results in more ranges than are strictly necessary,
it makes the contents of the ranges clearer. The second part of the comment
(in square brackets), indicates the number of items in a range, if there is
one. The third part is the name of the character in field zero: if it is a
range, then the character names for the ends of the range are separated by
"..".</li>
</ul>
<p>However, the comments are purely informational, and may change format or be
omitted in the future. They should not be parsed for content.</p>
<h2><a name="References">References</a></h2>
<table cellspacing="12" cellpadding="0" width="100%" border="0">
<tbody>
<tr>
<td valign="top" width="1">[<a name="FAQ">FAQ</a>]</td>
<td valign="top">Unicode Frequently Asked Questions<br>
<a href="http://www.unicode.org/unicode/faq/">http://www.unicode.org/unicode/faq/<br>
</a><i>For answers to common questions on technical issues.</i></td>
</tr>
<tr>
<td valign="top" width="1">[<a name="Glossary">Glossary</a>]</td>
<td valign="top">Unicode Glossary<a
href="http://www.unicode.org/glossary/"><br>
http://www.unicode.org/glossary/<br>
</a><i>For explanations of terminology used in this and other documents.</i></td>
</tr>
<tr>
<td valign="top" width="1">[<a name="Reports">Reports</a>]</td>
<td valign="top">Unicode Technical Reports<br>
<a href="http://www.unicode.org/unicode/reports/">http://www.unicode.org/unicode/reports/<br>
</a><i>For information on the status and development process for
technical reports, and for a list of technical reports.</i></td>
</tr>
<tr>
<td valign="top" width="1">[<a name="U3.1">U3.1</a>]</td>
<td valign="top">Unicode Standard Annex #27: Unicode 3.1<a
href="http://www.unicode.org/unicode/reports/tr27/"><br>
http://www.unicode.org/unicode/reports/tr27/</a></td>
</tr>
<tr>
<td valign="top" width="1">[<a name="Versions">Versions</a>]</td>
<td valign="top">Versions of the Unicode Standard<br>
<a href="http://www.unicode.org/unicode/standard/versions/">http://www.unicode.org/unicode/standard/versions/<br>
</a><i>For details on the precise contents of each version of the
Unicode Standard, and how to cite them.</i></td>
</tr>
</tbody>
</table>
<h2><br>
<i><a name="UCD_Terms">UCD Terms of Use</a></i></h2>
<h3><i>Disclaimer</i></h3>
<blockquote>
<p><i>The Unicode Character Database is provided as is by Unicode, Inc. No
claims are made as to fitness for any particular purpose. No warranties of any
kind are expressed or implied. The recipient agrees to determine applicability
of information provided. If this file has been purchased on magnetic or
optical media from Unicode, Inc., the sole remedy for any claim will be
exchange of defective media within 90 days of receipt.</i></p>
<p><i>This disclaimer is applicable for all other data files accompanying the
Unicode Character Database, some of which have been compiled by the Unicode
Consortium, and some of which have been supplied by other sources.</i></p>
</blockquote>
<h3><i>Limitations on Rights to Redistribute This Data</i></h3>
<blockquote>
<p><i>Recipient is granted the right to make copies in any form for internal
distribution and to freely use the information supplied in the creation of
products supporting the Unicode<sup>TM</sup> Standard. The files in the
Unicode Character Database can be redistributed to third parties or other
organizations (whether for profit or not) as long as this notice and the
disclaimer notice are retained. Information can be extracted from these files
and used in documentation or programs, as long as there is an accompanying
notice indicating the source.</i></p>
</blockquote>
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